If You Wanted To Assign any Shortcut key to Particual Application Its very Simple task,
Just Rightclick On The Shortcut And Select Properties,
In that In The Shortcutkey Box Keep the Cursor There 
and Click any Combination of keys From the keyboard like 
Ctrl+Shift+H, Alt+J Like This,
And Then Click On Apply and then Click On OK,
Thats it :)

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