INT D4 - PC-MOS/386 v3.0+ - GET TASK CONTROL BLOCK AH = 04h BX = task ID or FFFFh for calling task Return: CF clear if successful ES = segment of Task Control Block (TCB) (see #04006) CF set on error AX = error code (see #01680 at INT 21/AH=59h/BX=0000h) Note: superseded by AH=27h SeeAlso: AH=02h,AH=27h,AH=28h,AH=29h,AH=2Ah,INT 38