Compatibility:  Undoc  3.0+
Expects: AX    ae01H
DS:SI address of an 8-byte upshifted, blank-padded command name
(save command-line text addr from previous INT 2fH ae00H)
                                                                  
Returns:       Previously-passed command buffer should be modified:
Set the length field to 00H to indicate command completed.
                                                                  
Info: This is part two of a system that lets TSRs intercept commands
typed at the DOS command prompt.

See INT 2fH ae00H for details on what happens in part one.  After
you return AL=ffH from that notification, COMMAND.COM immediately
calls this function (AX=ae01H) to give you a crack at processing
the command.

Important: This command does not supply the full command-line
text.  You must save the DS:BX value passed in the previous
AX=ae00H notification.

  Handling a Command Internally  
Examine the command line text (as pointed to by the DS:BX
obtained in the earlier ae00H call).  Take whatever action you
deem necessary.  Set the command length to 0 (DS:BX+1) and IRET
to return control to COMMAND.COM.

  Cancelling a Command  
Just set the saved DS:[BX+1] to 00H and IRET to return control to
COMMAND.COM.

  Pre-processing a Command  
It is possible to examine command-line switches and options, make
some changes, and then pass the result on to be handled by
COMMAND.COM or some other INT 2fH handler.  In this case, use a
FAR JMP to pass control down the chain of INT 2fH handlers, to
give them a crack at the command.  In any case, if the command-
line length is non-zero, it will be processed eventually --
either by another INT 2fH handler or by COMMAND.COM.

Notes:   If Doskey is installed (see INT 2fH 4800H), then Doskey will
get a crack at the command-line before you do.  You might
consider chaining into that service as well.

  Note that batch file commands are passed through this system,
so you can make a bullet-proof connad filter.

See Also: INT 2fH aexxH Command Processor Hook
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INT 2fH ae01H: Process Hooked Command