REXX Tips & Tricks, Version 2.80

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The SET command

Use the undocumented switch /S of the DOS command <SET to get the number 
of remaining free bytes in the DOS environment. 
Note that you do not need this option in OS/2 sessions because the size of 
the environment of OS/2 sessions is dynamic.   
Source:  The OS/2 WARP Survival Guide 

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