[F3] Select (Clear or Set Trap)

Select this option to reverse the active/inactive “trap” status of the current statement line. You need to move the cursor to the desired line and then press select (F3) to initiate a TRAP (if it is not already brightened), or deactivate a TRAP (one that is currently brightened). select lets you “toggle” back and forth between active and inactive “trap” status. Remember, you can use select on a TRAP statement as well as on any other statement type.