Create own ALT+H mapping, disabling the help menu

Hi,

I would like to make a mapping to
ALT+H.
But this brings up the help menu in gvim on windows 7, as the H from
Help is the underlined key (don't know the right terminology)
Can you disable this in gvim, so that I can create my own ALT+H mapping?

Rgds,
Jeri

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