Key binding with multiple modifiers

[Chris Laux]

Hello,

What is the correct way to bind a key modified by both the control and
the meta key?  I failed to find an example in the help texts and the
following command doesn't work:

(global-set-key "\C-M-7" 'shell)

When I try the following, the binding is listed when accessed with C-h
b, but actually pressing the keys just gets "C-M-7" printed in the
minibuffer:

(global-set-key [C-M-7] 'shell)

Any help would be greatly appreciated,

Chris