Mapping doesn't work

[Matthew Gilbert]

Hi All,

I'm using GVIM on WinXP SP2:
VIM - Vi IMproved 7.0 (2006 May 7, compiled Mar 20 2007 10:01:10)
MS-Windows 32 bit GUI version with OLE support
Included patches: 1-219
Compiled by [EMAIL PROTECTED]
Big version with GUI.  Features included (+) or not (-):

I'm trying to map ALT-ENTER. It doesn't work (I just get enter). I'm 
using the following:

inoremap <M-CR> asdf

If can map SHIFT-ENTER using the same method and it works great. Is 
mapping ALT-ENTER possible? Thanks _matt