PURGE            Delete Macro Definition                       MASM Directive
 
  PURGE     macroname,,,
 
    Deletes one or more macro definitions, freeing up memory.
 
       Notes:     If a call is made to a macro that has been PURGEd, then
                  an error is generated.
 
                  There is no need to PURGE a macro when you wish to
                  redefine it.  By redefining it, the old macro definition
                  is automatically PURGEd.  A macro can PURGE itself by
                  making the last line of the macro the PURGE directive.
 
                  This directive can also be used to easily remove macros
                  not needed from a macro library.
 
                  If the macroname is a directive or instruction mnemonic,
                  the directive or instruction mnemonic is restored to its
                  original value.