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SetUEvent is used in user-event trapping. It sets the BASIC entry point
that causes a user-defined event.
 
Usage Notes
    ■ SetUEvent signals an event for the ON UEVENT event-handling routine.
    ■ The SetUEvent routine is a part of BASIC, and is automatically
      included in compiled applications or when running QBX with
      the /L command-line option. Your interrupt-service routine must
      call SetUEvent; it is the only way to alert your program that the
      event has occurred. You can call SetUEvent from a non-BASIC language.
    ■ To use the SetUEvent routine in the QBX environment, use any Quick
      library. To use SetUEvent outside the QBX environment, you do not
      have to link to a library.