Assigning "Lock Computer" to "My Favorites" buttons on Microsoft Natural Ergonomic Keyboard

Assigning "Lock Computer" to "My Favorites" buttons on Microsoft Natural Ergonomic Keyboard

I have a Microsoft Natural Ergonomic Keyboard 4000, which has five "My Favorites" buttons along the top-center which can be programmed. Using IntelliType Pro (software downloaded from Microsoft), I'd like to set up one of these buttons to perform a "Win+L" to lock my computer.