Library /sys$common/syshlp/pca$help.hlb SET, KEY, Description  *Conan The Librarian (sorry for the slow response - running on an old VAX)

    When you define keypad keys using the DEFINE/KEY command, you
    can assign a specific state name to each key definition. The
    PCA-defined state names are DEFAULT, GOLD, BLUE, CONTRACT,
    EXPAND, and MOVE. If the assigned state is not set when you
    press the key, the command string to which the key is bound is
    not processed. You use the SET KEY command to change the current
    state so that keys for the specified state are processed.

    If you do not use the SET KEY command, the current keypad state
    is DEFAULT.