ON UEVENT GOSUB - an error-trapping statement that defines the
                  event-handler for a user-defined event
 
Syntax
  ON UEVENT GOSUB {linelabel | linenumber}
    - linelabel or linenumber is the first line of an event-handling
      subroutine
    - See Details for instructions on how to write the code
      for user-defined event-handler modules
 
See Also  <UEVENT>