Compatibility: 6.0+
Expects: AX    ffffH
ES:BX address of a MRCInfoRec structure filled via INT 2fH 4a12H
                                                                  
Returns: AX    0000H = success
                                                                  
Info: This fn is used only by MRCI servers.  If, at load time, a MRCI
server detects that another MRCI server is already active, it can
compare the capacities and version of the installed server to
those of it own.

If it believes that it can do a better job, it (presumably) could
use this fn to tell the other driver to deinstall itself.

However, the example code in the MRCI spec does not use this.
Instead, it edits the old server's MRCInfoRec structure to point
to its own entry address (a technique which would not work if the
structure were in ROM).

See Also: MRCI API
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MRCI Fn ffffH: Deinstall Server