******  V X R E F **** Variables Cross Reference 

..the utility to show all lines where a variable is 
used; for all BASIC programs written in GW/PC Basic 
or BASICA and saved with A-Option ( i.e. as ASCII 
File); can be run on all IBM PCs and clones of low 
compatibility with DOS 2.0 or higher.

Features

VXREF is was compiled by MS Quickbasic (V 4.0), thus 
it is a fast, easy to use utility. It needs a simple 
BASIC source (in ASCII) as input, the neat list is 
created directly on printer or as a print file. 

VXREF is migthier than other programs of that kind, 
the reason why the author made up to it. It avoids 
common errors by this way:
- lines are n o t renumbered, whereas labels are 
   discarded 
- distinction between variables and arrays of same 
   name is made, e.g. A <> A(..)
- type declarations and system variables are ignored
   as legal variables (that means DEFINT A-I,X or 
   ERR, TIME$, EOF do n o t set up A,I,X or 
   ERR,TIME$,EOF in the output list) 
- each occurance of a variable inside a line is men- 
  tionned o n c e and does not blow up references


How to use 

VXREF is evoced by typing "VX", what will start the 
compiled program VXREF . Before it make sure  

- that the BASIC programm to be analysed is on disk as 
  ASCII file
- there is enough work space on standard disk drive 
  for the needed work file ( <= source in length)
- the printer is ready or in case you want a print 
  file theres enough space on disk

After starting you are prompted for the source file's 
name; you can type drive, path etc as far as your DOS 
allows that. This name is used with extension .PRN to 
create a wanted print file. Thats all to pay atten- 
tion for... 

At last one warning - dont break the running VXREF 
(with CNTRL BREAK), it leaves open files on disk !


Files on this disk

VX.EXE          executable file of VXREF
READ.ME         this instructions


********** VXREF is free software, you may copy or 
pass it as long as this remark, the instructions and 
the EXE File VX is completely transmitted. No fees or 
retail costs may be charged except pure distribution 
expenses ********************************************

If you are satisfied and VXREF had been of good use 
for you  send 5 US$ or equivalent in europeen curren- 
cy (no checks) to 
                      W. Kremer
                      Hoffnungsthaler Str 40
                      D - 5064 Roesrath
                      Fed Rep of Germany

As value you will get the latest release, the full 
basic souce code (!), more detailed instructions 
(e.g. how to enlarge VXREF for more commands), an 
example file to see how VXREF works and the autor's
helpline on request. 
 
Copyright by W. Kremer, D-5064 Roesrath
             Release V 1.3 - March 31, 1988