Title:      "Once is Enough"
Reference:  PC World February 1990
Author:     Michael Payne
Files:      ONCE.DOC, ONCE.BAT

Not all memory resident programs can prevent themselves from being
loaded more than once. To make sure you don't load the same resident
program again and again, insert the command

set tsr=not_installed

into your AUTOEXEC.BAT file. Then, copy and rename ONCE.BAT. For
example, if your TSR is named MYTSR, you might name the batch file
RUNMYTSR.BAT. Modify the batch file, replacing tsr with your TSR's
file name.

Now when you type RUNMYTSR to load the batch file, if it's already
loaded, the batch file will recognize that fact and refuse to load
another copy into memory.

--[Cut here]----------------------------------------------------------

echo off
if %tsr%==installed goto run_app
tsr
set tsr=installed
:run_app
c:
cd \appdir
app

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