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

     Causes a key, rather than a symbol, to be defined.  If you use this
     qualifier, the symbol parameter must be the name of a key on your
     terminal keyboard, and the expression parameter must be the SDA
     command that is to be executed when the key, followed by a carriage
     return, is pressed.

     For example, use the command below to define the PF1 key to
     execute the SHOW STACK command.

         SDA> DEFINE/KEY PF1 "SHOW STACK"