Assembly Language Help (alang.hlp) (Table of Contents; Topic list)
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Delete Macros from Memory
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  Syntax:   PURGE macroname [, macroname]...
 
  See also: MACRO
 
  Description:
 
     Deletes one or more currently defined macros from memory. Use this
     directive if your system does not have enough memory to keep all
     the macros needed for a source file in memory at the same time.
     The macro skeleton will remain, but it will not expand.
 
     A macro can remove itself if PURGE is on the last line of the
     macro. Redefining a macro automatically purges the previous
     definition. Calling a purged macro is legal, but the macro will
     act like a blank macro.
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