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  Name:     key() - turn keyboard on and off
  Usage:    [<logical>] = key[<status>])
  Params:   logical <status> - .T. turns keyboard on, .F. turns it off
  Returns:  logical equal to the current status of the keyboard. .T. if
            it is on, otherwise .F.

 ---------------------------------- Example ---------------------------------

                 * prevent CTRL/ALT/DEL while indexing
                 key(.F.)
                 index on empname to empname
                 key(.T.)
                 keyboard ""    && clear extraneous keys

  Note:     If you press CTRL/ALT/DEL When the keyboard is off
            the computer will not reboot. However, the keystrokes
            are still buffered and will be executed as soon as you
            issue a key(.T.).