Assembly Language Help (alang.hlp) (Table of Contents; Topic list)
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@TSR Macro
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  Include:   DOS.INC
 
  Syntax:    @TSR paragraphs [,return]
 
  Summary:   Terminates a program, but leaves it resident in memory
 
  Arguments: <paragraphs>     Memory in paragraphs (16 bytes) to
                              allocate for resident program.
             <return>         Code to return to DOS; if none, AL used.
                              Must be a constant.
 
  Returns:   No return value
 
  Modifies:  AX, DX
 
  See also:  Int 21h Function 31h
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