Compaq Armada 7400 Reference Manual page 28

first programmable key
second programmable key
third programmable key
fourth programmable key
You can set the four programmable keys to quickly open an
application on your computer, bring up a document, or emulate
one of the Microsoft Windows and Application Logo keys.
By assigning the programmable keys to schemes, you can create
multiple sets of key assignments to tailor your computer for
various uses or accommodate more than one user.