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Int 21 Fn 64 - DOS 3.2+ Internal - Set Device Driver Lookahead Flag [D]
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
See Also: AH=01h,AH=08h,AH=0Ah,AX=5D06h
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