CHANGES BETWEEN Sc/X6.22 and 6.22
Bill Lash
        -bug in write_fd where a string value could be lost
Jeff Buhrt
	-'/' (range commands) is now 'r', '/' is the main menu that the mouse
		brings up.

CHANGES BETWEEN 6.22 and 6.21
R. J. Bassett
	-help.c to reflect the addition of the 3rd format parameter.
Anthony A. Datri
	-help.c fputs was missing stdout
Steve Simmons
	-made pass gcc -Wall
	-SunOS 4.1.1 configuration which both allows the use of gcc and
	 does not require the SysV software set be installed
	-'-N' command line option for no cursor
	-SHOWCURSOR will also build into sc.doc, the start of site specific
	 building of sc.doc, etc.
Marc Staveley
	-noted convert_date() is redunant and got the date wrong after a
	 leap day, now uses dodts()
**	-dodts needs to be fixed for years > 2000 and < 1970
Bruce Barnett
	-sent his and Michael Wagner's disk partition calculator, included
	 in samples/
Keenan Ross
	-noted a problem with a define not getting passed, fixed by 'FEATURES'
Kevin Cosgrove
	-noted the suffix sc adds for the 'W' and 'T' commands may not match
	 what is written (see below)
Francois Pinard
	-suggested adding command line options to scqref
	-pointed out man page changes
Teus Hagen
	-suggested easier regular expression config
Dennis R. ( Chaos Central ) Conley
	-TIOCGWINSZ code for ultrix (and SysV R4) for window resizing
Tom Kloos
	-reworked 'F' formatting
Jeff Buhrt
	-added fsuffix to remove the .sc suffix and add a new suffix,
	 the reported default filename will now match the actual written
	-added 'F' format type 5 (engineering exponential form)

CHANGES BETWEEN 6.21 and 6.19
Mark R. Rubin
	-noted a problem using bison 1.16 (use any version but 1.16)
Marco S Hyman/Ian */and others
	-Crypt/CRYPT_PATH define problem
Paul Eggert
	-sc.doc $Revision: 6.21 $ 'buglet'
Ulf Noren/Dave Lewis
	-AIX3.1/Microport System V/AT don't have notimeout()
		changed NONOTIMEOUT to NO_NOTIMEOUT, define if not present
Niels Baggesen
	-function keys may not return ascii codes that isascii() understands
	-added an A command for vi mode (add at end of row).
	-Special key support: DC='x' (del char in vi mode), FIND='g' (goto),
		HELP='?', SELECT='m'
Dave Davey
	-noted Ultrix 4.2 curses doesn't have idlok()
		[I added NO_IDLOK in Makefile]
Kim DeVaughn
	-added ${RIGHTBUG} is now passed to sc.o && screen.o
	-suggested a better fix on SunOS 4.x dont use the Sys V
	 package (CC = /usr/5bin/cc, etc), but use the BSD 4.3 defines
David Bonnell
	-scqref [will produce] TROFF output instead of plain text, 
	 [when] you define QREF_FMT=TROFF in the Makefile.
	 The resulting quick reference guide uses the MS macro set and you 
	 build with something like:
		scqref > quickref
	 	troff -ms quickref > quickref.ps
Kurt Cockrum
	- sc.h:
		If not (defined(BSD42) || defined(BSD43) && !defined(ultrix)),
		include <memory.h> for the benefit of some USG systems...
	- screen.c:
		Repaired cpp logic:
		don't mention IDLOKBAD or idlok() unless SYSV3 defined;
		idlok() does not exist for USG pre-SYSV systems (may exist for
		SYSV{2,3,4}).
	- tutorial.sc:
		Repaired a number of off-by-1 errors.
Mats Wichmann
	-cleaned up Robert E. Cousins MIF format support code which is
		compatible with FrameMaker.
Neil Skilling
	-added @numiter which returns the number of iterations performed.
	 It allows you to solve equations by direct substitution. Taking a
	 guess from another cell if the first iteration otherwise taking the
	 last best iterate. Other uses may be found.
Martin MacLaren
	-MS-DOS cleanup of Makefile
Art Mulder
	-^T toggle: don't list crypt if not available
John Amanatides
	-pointed out a possible NULL ref in interp.c
Phil Johnson
	-sc now appends: "asc", "cln", "tbl", etc. to output files
	-made the engineering format match that used by an engineer
	-deleted an unused engmult[] reference
	-added a fix to struct enode for the HP compiler
Kevin Cosgrove
	-noted sc should use any predefined PI
Jeff Buhrt
	-'make clean' now leaves the binaries and man pages [Jean-Pierre Radley]
	-'make clobber' cleans all built files (like clean used to) [""]
	-'-D' vs '-S' was needed on a XENIX2_3 line [""]
	-'quit()' -> 'doquit()', function conflict [""]
	-change xmalloc,xrealloc,xfree -> scxmalloc,scxrealloc,scxfree
		(xmalloc is a standard malloc)

CHANGES BETWEEN 6.19 and 6.18
Tom Tkacik
	-sc.doc and CHANGES changes
Edgard
	-moving right off the screen now redraws vs optimize
Sisira Jayasinghe
	- added build.com (VMS) and VMS fixes
Jonathan I. Kamen && Charlie Shub
	-noted fmod doesn't exist on BSD4.3 and Mt Xinu 
Ben Priest
	-vi compatability: ' ' moves right as well as 'l' while line editing
Jeff Buhrt
	-one more possible NULL pointer fixed
	-added NONOTIMEOUT for those that don't have notimeout() in curses
	-undef CRYPT=-DCRYPT_PATH... if crypt isn't available
	-merged simple fmod into interp.c if fmod() is not present

CHANGES BETWEEN 6.18 and 6.17
James Dugal	
	- NULL pointer fix for is_locked
Kevin Pye
	- add a new mode suitable for entry of large amounts of data.
		moves to next cell on return, maxrow/col when to start
		entering in the next row/col. (see help screens B&C)
	COMMANDS ADDED: ^Tz, ^Tr, Srowlimit=?, Scollimit=?
David Fox - added a date format so that columns whose values are the number
	of seconds since 1/1/70 will be displayed as dates in the format
	dd-mmm-yy, and a modification to the grammar so data entered in the
	format dd_mm_yy will be converted into the number of seconds since
	1/1/70.
	COMMANDS ADDED: f # # 3
Teus Hagen
	- labels are centered strings
	- constant strings with '\' preceeding character will
	  be wheeled over the column width
	- a restart of sc on an sc file will go to last used cel
	- added toupper, tolower and do proper word capitalization
	COMMANDS ADDED: @toupper(), @tolower(), @capital(), @pi, "\[String]
Jeff Buhrt
	- external functions null/previous message was backwards
	- cleaned up help.c by inserting a new screen
	- found a possible NULL pointer in screen.c

CHANGES BETWEEN 6.17 and 6.16
Ulf Noren
	- added cell locking, disallowing input, to ranges of cells
Herr Soeryantono
	- I added ifdef's around curses KEY_* functions his curses didn't have
		(Sun/OS 4 on a SPARC)
Jay Lepreau
	- changes to tutorial.sc: how to get out, should be used w/ 24 lines
	- IDLOKBAD was not passed to screen.c
	- suggested error messages if the execl of crypt fails
	- pointed out BSD's crypt is in /usr/bin/crypt
Henk P. Penning
	- suggested Makefile list the mode of the man page & tutorial.sc
	- make install will now install the psc man
	- yylval was not known in lex.c for HP-UX 7.05
Edgard
	- hitwinch fixes
	- KEY_HOME now takes you to 0,0
CHECK KEY_NPAGE/PPAGE
Stephen (Steve) M. Brooks
	- suggested the man pages should include Sc's revision
Dan Banay
	- code to set LINES and COLS after a window size change
Bart Schaefer
	- @myrow/@mycol fix
Bruce Jerrick
	- noted ln may not always work for the temporary source files
Gene H. Olson
	- fixes for SIGWINCH for Sun OS 4.1.1
Teus Hagen
	- added three functions:
		1) allow @PI as well
		2) @upper/@lower for casing characters in a string
		3) @capital for upper case first char of words in a string.
Martin Maclaren
	- added MS-DOS support
		COMPILER USED: Microsoft C, 5.1
		TOOLS USED   : NDMAKE GNUBISON GNUSED PCCURSES
Cuong Bui
	- has a working Vietnamese version of sc, noted a A_CHARTEXT
		mask problem
Jeff Buhrt
	- when numeric prescale is on: 300 -> 3.0, now 300. -> 300. not 3.0
		(numbers with a decimal aren't scaled)

CHANGES BETWEEN 6.16 and 6.15
Tom Tkacik
	-fixed a bug in ^W
Jonathan I. Kamens
	- added Makefile rules so scqref and psc don't clobber .o's
Larry Philps
	- fixed a SCO XENIX vs M_XENIX problem
	- fixed a problem where dosval() might not xmalloc enough memory
Dave Close
	- fix for Xenix 2.3 to reset terminal modes

CHANGES BETWEEN 6.15 and 6.14
Lowell Skoog
	- fixed a bug in 'F'ormat
Henk Hesselink
	- format.c double neg. sign 
	- interp.c minr/minc bug, plus modflg wasn't set
	- fixed a hardcoded path in sc.doc
	- improvement: 
		-show current cell format in top line
		-[buhrt: go into edit mode on the old format if it existed
			otherwise insert mode]
Jonathan Crompron
	- made sure doformat() does a checkbounds()
Stephen (Steve) M. Brooks
	- pointed out -s in psc was broke
Michael Richardson
	- fixed negative numbers in exponential format

CHANGES BETWEEN 6.14 and 6.13
Mats Wichmann
	- Sys V R4 patches, fixed 'Press RETURN ...' on a shell command
Tim Theisen
	- changed #define for memcpy/memset under ultrix
Rick Walker
	- Added @myrow and @mycol to give the row/col of the current cell
	'The two functions are @myrow and @mycol, which return the numerical
	row and column of the calling cell.  The cell directly above a cell
	in the D column could then be accessed by @nval("d",@myrow-1).'
	NOTE: @myrow and @mycol can't be used in specifying ranges.

CHANGES BETWEEN 6.13 and 6.12
Rick Walker
	- pointed out a move(x,y)-> (y,x) in sc.c
Glenn Barry
	- Further SunOS 4.X cleanups
Tom Tkacik
	- made sure 'J' moves downward 1/2 a screen even at the bottom
David I. Dalva
	- pointed out crypt may not be in /bin/crypt
Gregory Bond
	- allows the vi-mode editing of very long expressions
		(> 1 screen width) to work on 2nd + subsequent lines
Tom Anderson
	- "let A1 = aaa" (where aaa is defined as A0:A0) is now valid
	- added autolabeling
		'When there is an empty cell to the left of a cell that has
		just been defined (with /d), a label is created in the blank
		cell.  The label holds the definition that has just been
		created.  This labeling is only done for definitions of single
		cells (and not for ranges).'
		'The feature can be turned on and off with a toggle (^T)
		command'
Petri Wessman
	- Added support for SLaTeX, 'a Scandinavian version of LaTeX, in
		intensive use ... in Finland and in Sweden'
Jeff Buhrt
	- vmtbl.c explictly set arrays of pointers to NULL, vs memset()
	- psc   [-P] plain numbers only:a number only when there is no [-+eE]
		[-S] all numbers are strings
	- psc: a number must end in [0-9.eE] anything else makes it a string
		(4, 4., 4.5, and 4e are numbers; 4-, 4+, etc are not).
	- psc: made sure we grow enough when we call growtbl()
	- cleaned up the Makefile w/ a few suggestions
	- SIGWINCH is delt with next time the screen would update (testing)
	- added IDLOKBAD to get around a SysV curses bug (see Makefile)
	- moved screen functions into screen.c (except for one indirect
		'repaint()' call in sc.c, and help.c)

CHANGES BETWEEN 6.12 and 6.11
James Dugal
	- added format.c to SRCS in Makefile
	- noted RETURN didn't enter insert mode
Peter King
	- pointed out iscntrl is broken on some other systems as well
	- sent some lint cleanups
Michael Richardson
	- patch to stop format looping when scientific notation was selected
Glenn T. Barry
	- code to turn on hardware scrolling and added 'slow speed display'
		speedups, default for SYSV3 or see -DSUNOS41SYSV in Makefile.
Tom Tkacik
	- fixes to make sure J and K move same amount, and re-added H code
Jeff Buhrt
	- fixed a possible xfree(NULL) in getent() (found when adding K_VAL)
	- merged compiler cleanups
*	- added $(name)qref to print a Quick Reference card
	- got rid of INVALIDS that may have been left around
*	- pressing return on a empty line puts you into insert mode
		(like in <=Sc6.1). When entering you can also press ESC
		to go into the editor (no change); this is also documented
		now so it might stay around this time.

CHANGES BETWEEN 6.11 and 6.10

Jonathan I. Kamens
	- sc.doc now mentions the tutorial file in the FILES section
Andy Fyfe
	- pointed out 3 locations where a NULL should have been '\0'
Robert Bond
	- pointed out the ERROR could hide a cellerror
Piercarlo Grandi
	- H,J,I,K now move 1/2 screen
Ulf Noren
	- changes for AIX V3.1
		- defined CHTYPE and NLS for the preprocessor. CHTYPE is
		the type of every character in a curses window.
		- Added KEY_BACKSPACE to nmgetch
		- strtof ifdef
	- Iteration change: when Sc says: "Still changing after 9 iterations"
	Sc at that point will have eval'd 9 times
Chris Metcalf
	- pointed out I broke setlist when adding 'goto {error,invalid}'
James P. Dugal
	- iscntrl() wasn't handling TABS though CRs under Pyramid OSx4.1
Peter King
	- BROKENCURSES patch for nl()/nonl() bug on some BSD systems
	- backups, tutorial file, and man references now depend on $name
	- DFLTPAGER to DFLT_PAGER fix

CHANGES BETWEEN 6.10 and 6.9

Tom Tkacik
	- when moving off the current table (resizing) now move the cursor
		on 'l' or 'k'.
	- patches to sc.doc to correctly format the vi-mode notes
Jim Clausing
	- made sure / doesn't try to divide by zero.
Tom Kloos
	- correction to substr() example in help.c
Piercarlo "Peter" Grandi
	- Disable non-constant expressions while loading
	- Added extra code in dealing w/ floating point exceptions
	- #ifdef'd SAVENAME (vs hardcoded SC.SAVE) to allowing changing the
		emergency save name.
Casey Leedom
	- Makefile changes: man extension, RINT note, make values should
		never be left undefined and then referenced, don't leave
		around *.old's
Tom Anderson
	- patches to add type of column format (note format now has 3 args)
Jeff Buhrt
	- xmalloc/xfree fatal() will now call diesave()
		(MAKE SURE the saved file is ok if this were to happen)
	- history[] is now a circular queue, this will cut down on the
		number of data moves and also xmalloc/xfree calls
		(idea from Keith Bostic)
	- cells with an error (ex: divide by 0) will show 'ERROR'
	- you can 'goto error' (or 'goto') to find an ERROR (for next ERROR)
Robert Bond
	- When in numeric mode the ^B, ^F, ^N, ^P key will end a numeric entry.

CHANGES BETWEEN 6.9 and 6.8

Jim Richardson
	- pointed out vi mode was not documented in sc.doc
	- found a nasty buffer limit bug in savedot()
	- a side effect was ^D could cause a core dump (-Jeff)
Tim Wilson
	- Hints on compiling on Ultrix
Eric Putz
	-patch for printfile() (sc died on huge # of columns in a W)
Jeffrey C Honig
	-patch for lex.c which bombed on SunOS 4.1 if $TERM was not set
Tom Kloos
	-psc now calls [+-.] strings vs numbers.
	-also pointed out a format reversal problem
Jack Goral
	-changes to Makefile to compile under SCO Unix V rel 3.2.0
Mark Nagel
	-changes to allow arbitrarily complex formatting of cells 
Kim Sanders
	-^W generated an incorrect equation (line was not started at beginning)
Mike Schwartz
	-a put command will use the same encryption key as when the
	file was read.
	>I have a suggestion for making the encyrption option of "sc" more
	>usable:  Right now, if you use the -x option when you start up sc, it
	>prompts you for the key (just like "vi -x" does).  But when you try to
	>write the file out using the Put command, it asks for the key again
	>each time.  Why not make it use the same key you used before (as "vi
	>-x" does)?  That would really help, because as it is, each time you try
	>to save the file you run the risk of mistyping the key.
	>
	>You might think this causes a security problem, since the key is then
	>an argument to crypt, and hence is visible from ps.  But when crypt
	>runs, the first thing it does is to copy the key to an internal buffer
	>and then zero out the argv copy, so the window of vulnerability is
	>vanishingly small.
Adri Verhoef
	- pointed out a ^D caused a core dump (fixed)
Gene H. Olson
	- format now grows the spreadsheet before setting the column format.
	- removed an extra ';' that caused a possible column number trashing
Paul Eggert
	-sc now also has round-to-even, also known as ``banker's rounding''.
	>With round-to-even, a number exactly halfway between two values is
	>rounded to whichever is even; e.g. rnd(0.5)=0, rnd(1.5)=2,
	>rnd(2.5)=2, rnd(3.5)=4.  This is the default rounding mode for
	>IEEE floating point, for good reason: it has better numeric
	>properties.  For example, if X+Y is an integer,
	>then X+Y = rnd(X)+rnd(Y) with round-to-even,
	>but not always with sc's rounding (which is
	>round-to-positive-infinity).  I ran into this problem when trying to
	>split interest in an account to two people fairly.
	-While we're on the subject, @round(X,Y) should also work when Y
	>is negative. For example, @round(123,-2) should yield 100.


CHANGES BETWEEN 6.8 and 6.7

Jeff Buhrt (with help from some beta testers-Thank you)
	  1) added a per row memory allocation
		-runs in about 1/2 run time and 1/3 the space of 6.6vm.1
		-insert/delete row now just moves pointers (# == maxrow+1-currow)
			and blanks one row (of columns (maxcol))
		-as the number of cells grows the size is more linear
			(no more ##Meg images except for 100,000's of rows....)
		-row to column pointer translation is done by a macro (ATBL)
			that returns a pointer to the cell pointer.
			*ATBL would be a pointer to a *ent (cell).
		-the maximum # of columns is limited by ABSMAXCOLS or
			sizeof(struct ent *)*maxcols (whichever is smaller)
			(702 * 4 = 2808 is no real limit even for 286 large model)
		-the maximum # of rows is limited by the virtual memory limit or
			sizeof(struct ent **)*maxrows (whichever is smaller)
			(4*X=64k, X=16384 rows (excluding malloc overhead) on
				a '286 large model. Even w/ 3.25Meg and 10Mhz)
			(plus of course any memory used for cells)
	2) dolookup (int vs double)
	3) dolookup calling eval w/ ent * not enode *
		 (dolookup called w/ ent * not enode *)
	4) cleaned up a lot of .... *x = 0 to  (.... *)0 (cmds, interp)
	5) psc: fwidth/precision were reversed on the output
	6) Backup copy (on save) using same mode to [path/]#file~
		 (will prompt if a backup fails)
	7) put y/n prompt function into yn_ask(mesg)
	8) found a move(x,y) in sc -> move(y,x) and only move when needed
	9) we use FullUpdate || changed (to see if ANY cells changed) 
		before trying to redraw the screen in update
		(now we don't try to redraw every time a key is hit)
		-if we are stand[ing]out we do not create a cell just to force a
		 standout inside the repaint section of update()
		-only draw blank cells if we cleared it or it is standing out
		reason: the less work (what to update) curses has to do, the faster
			a screen update will be (less cpu required)
	14) {insert, delete}col replaced w/ {open,close}col(currow, numcol_to_insert)
		(limits looping)
	6.7.1.1
	15) goto nonexistant cell may loop
	16) make sure that startup size will at least fill the screen w/ cells.
	17) added version.c
	6.7.1.2
	18) When we would normally die w/o saving (SIGQUIT, etc), we now ask
		if people would like to save the current spreadsheet.
		If 'y', saves to the current file name, otherwise ~/SC.SAVE,
		then /tmp/SC.SAVE if all else fails.
	6.7.1.3
	19) don't use malloc.c for production code
	20) progname is now truncated to just the basename (systems w/ long paths
		caused problems)

CHANGES BETWEEN 6.1 and 6.7

Dave Lewis - 
	Found and fixed a null pointer derefrece in the 'R' command.

Rob McMahon -
	Changed the ctl() macro to work with ANSI style compilers.
	Cleaned up some non-readonly text problems.

Rick Linck -
	Fixed a bug in lex.c - Ann Arbor Ambassadors have long ks and ke
	termcap entries.

Sam Drake -
	A fix for undefined C_* symbols in AIX.

Peter Brower -
	Cleaned up the INTERNATIONAL ifdefs with more portable code.

Glen Ditchfield
	Cleaned up a problem in crypt.c when the encrypted file shrank.

Bob Bond -
	Vi style editing for the command line.
	A bug in range name aliases.

Jeff Buhrt -
	-Added "~" filename expansion.
	-702 columns (A-ZZ) and unlimited rows/cells based on max. memory
	-fixed a few bugs
	-slightly decreased CPU usage
	-MAKES backup copies of files
	-understands ~$HOME stuff

CHANGES BETWEEN 5.1 and 6.1:

Andy Valencia -
	xmalloc aligns data to a double boundary.

Lawrence Cipriani -
	Fixed a bug in the "do you want to save this" sequence.

Soren Lundsgaard -
	A null pointer derefrence.

Rick Perry -
	Cleaned up a problem with modchk() in sc.c.

Gregory Bond -
	Added code for multi argument versions of @min and @max.

Tad Mannes -
	Added code to save/restore hidden rows and columns when the
	data base is saved or restored.

Marius Olafsson -
	INTERNATIONAL changes.  Allows full 8 bit characters (if
	curses supports them.)

Kurt Horton -
	Added support for @pv, @fv and @pmt financial functins.
	Tested lots of different systems, linting.

John Campbell -
	Support for VMS.  See VMS_NOTES.

Peter King -
	 User selection of row or column order for recalculation.
		Also affects order of traversing regions in /f and /r
	 User setting of automatic or manual recalculation.
	 User setting of number of times to try recalculation.
	 + and - commands when in non-numeric mode to do 
		increment and decrement operations.
	@index, @stindex, @atan2, @lookup  functions.
	Save/restore options.
	Support for TeX, LaTeX, and better support for tbl in "T" cmd.
	Provision of a copyent function to copy entries (same code repeated
		in several locations)
	Forwrow, backrow, forwcol, backcol functions to replace
		repeated code
	Correct interpretation of ESCAPE or ^G as an abort when in a 
		two character command such as 'ar' or 'ac'
	Cleanup in eval() - catches non-trap function errors.

Bob Bond - 
       Added search options to "g".
       Added supression of hidden columns to "W"
       Added the mod operator "%"
       New help functions.
       Constant prescale "$"
       Added string matching to @lookup.
       Some more bug fixes.
       Testing, integration, documentation.

Alan Silverstein-
	Greatly revised the manual entry.
	Added menus for ^E command and row/column commands, which
	involved a bunch of code cleanup.

	Changed top row display to clearly indicate string labels
	versus number parts, and to distinguish string functions from
	constant labels.

	When the character cursor is on a cell (not topline), ^H
	(backspace) is like ^B (move back one cell), rather than being
	ignored.

	When the character cursor is on a cell (not topline), ^I (tab)
	is like ^F (move forward one cell), rather than being ignored.
	^R is no longer identical with ^L.  Now ^R highlights all cells
	which should be entered by a user because they contain constant
	numeric values (not the result of a numeric expression).

	Added a ^X command, similar to ^R, which highlights cells which
	have expressions.  It also displays the expressions in the
	highlighted cells as left-justified strings, instead of the
	label and/or value of the cell.

	Added indirection functions (@nval() and @sval()) for simple
	table lookups.  Given a column name and row number, they return
	the numeric or string value of the selected cell.

	Added external functions (@ext()) for non-trivial
	computations.  Given a command name and argument, it calls the
	command and reads back one output line.

	Added a ^T,e command to toggle enabling of external functions.

	Changed ^T,t to only control the top line display, and added
	^T,c to control current cell highlighting.  (Separated the
	functions.)

	"!" (shell escape) gives a vi-style warning if there were any
	changes since the last write.  (No change to manual entry.)

	Fixed some startup, error, and prompt messages to be cleaner
	and/or more consistent.  (No changes to manual entry.)

	Fixed a bug:  If @substr() upper bound (third parameter) is
	past the end of the string operand, return the substring
	through the end of the string, rather than returning a null
	string.

	Fixed a bug:  Reset SIGINT to default after forking before
	calling shell escape program and before starting pipeline (for
	commands which support this).  Didn't reset SIGINT before
	calling crypt and external functions because in both cases it
	should be irrelevant.  (No change to manual entry.)

CHANGES BETWEEN 6.1 and 6.2:


Chris Cole-
	Compatibility with Lotus 1-2-3
		a) @hlookup(expr,range,expr)
		b) @vlookup(expr,range,expr)
		c) @round(expr,expr)
		d) @if(expr,expr,expr)
		e) @abs(expr)
