Category: <b>DOS kernel</b>
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<pre><b>INT 21 - DOS 3.2+ internal - SET DEVICE DRIVER LOOKAHEAD FLAG</b>

	AH = 64h
	AL = flag
		00h (default) call device driver function 5 (non-dest read)
			before INT 21/AH=01h,08h,0Ah
	    nonzero don't call driver function 5
Return: nothing (MS-DOS)
	CF set, AX=error code??? (DR DOS 5.0, which does not support this call)
Notes:	this function is called by the DOS 3.3+ PRINT.COM
	under MS-DOS, this function does not use any of the DOS-internal stacks
	  and may thus be called at any time, even during another DOS call
SeeAlso: AH=01h,AH=08h,AH=0Ah,AX=5D06h
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