Overriding system shortcuts in OSX

[Howard Bornstein]

I want to command-H for a menu item in my standalone, but it doesn't work
because the system uses command-H for Hide Application. Even though I've
assigned this shortcut to a menu item, it is ignored and the system command
is used instead.

It seems like this should be simple but I can't figure out how to get
around this problem. Is there a way to override system shortcuts in an OSX
standalone application?

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Regards,

Howard Bornstein
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