Compatibility:  Undoc  3.0+

This MUX interrupt is  undocumented  through DOS 6.0.  It is intended
as way to intercept commands submitted to the DOS command processor
(COMMAND.COM).  A TSR hooked into the chain can examine a command line
and decide to pass it on (do nothing) or process the command its own way.

For instance, this provides a way to implement additional "DOS internal"
commands and/or keep users from executing dangerous command such as DEL

See: ae00H (notify pending command)

ae01H (process hooked command)

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INT 2fH aexxH: Command Processor Command-Line Hook