RE: C-M-TAB stand-in for M-TAB, on MS Windows?

[Drew Adams]

> > On what version did you test this?
> 
> It seems to work on this version:
> 
> GNU Emacs 23.0.60.1 (i386-mingw-nt5.1.2600)
>  of 2008-05-04 on LENNART-69DE564

Whoa! This even works (with Windows XP) on Emacs 20!

After decades of using Emacs, including a decade on Windows, I never heard of
this function - learn something new every day. 

This should be documented. 
Perhaps M-tab should be "registered" by default.
There should be an easy way (is there?) to UNregister a hot key.