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 ON TIMER(n&) GOSUB {linenumber | linelabel}
 
 Usage Notes
   ■ If your program contains event-handling statements and you are compiling
     from the BC command line, use the /W or /V option. If you do not use
     these options and your program contains event traps, Visual Basic
     generates the error message, "ON event without /V or /W on command
     line." See: ◄BC Command-Line Options►
 
   ■ The RETURN linenumber or RETURN linelabel forms of RETURN can be used to
     return to a specific line from a trapping routine. However, any GOSUB,
     WHILE, or FOR statements active at the time of the trap remain active.
     Visual Basic may generate error messages such as "NEXT without FOR."
 
   ■ If an event occurs in a procedure, a RETURN linenumber or RETURN
     linelabel statement cannot get back into the procedure, because the
     line number or label must be in the module-level code.
 
   ■ The ON TIMER statement specifies only the start of an event-trapping
     routine. The TIMER statement determines whether the routine is called
     and how events are handled when trapping is off. See: ◄TIMER Statement►