Results from commands.
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If a command returns a value or information, the data will generally be
returned in the  RESULT  variable. The only exceptions to this are the
 dopus getdesktop ,  dopus getstring  and  lister getstring  commands
which return information in the special  DOPUSRC  variable.

 Error  codes are returned in the  RC  variable.

You must include the line  "OPTIONS RESULTS"  near the top of your script
to enable the  RESULT  variable. See an ARexx manual for more information.