Assembly Language Help (alang.hlp) (Table of Contents; Topic list)
InDos Flag Interrupt
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  Interrupt:   21h     Function:   34h
 
  Title:       Get Address of InDos Flag
 
  See also:    Terminate and Stay Resident
 
  Description:
 
     Returns the far address of InDos flag, maintained by DOS to signal
     activity. The InDos flag is set when DOS functions are executing,
     and is clear otherwise.
 
     Input       Output
 
     AH = 34h    ES:BX = Address of InDos flag
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