PEN                      Enable/Disable Pen Read and Trap           Statement

 PEN {ON | OFF | STOP}

    Enables or disables the PEN function (which returns light pen status
    information. Also enables or disables trapping of light pen activity.

          ON    Enables reading of the light pen status, via the PEN
                function, and causes Turbo Basic to check for light pen
                activity.

         OFF    Disables reading of the light pen status and causes Turbo
                Basic not to check for light pen activity. This is the
                default condition.

        STOP    Disables reading of the light pen status and deactivates
                trapping, but Turbo Basic continues checking to see if the
                pen has been activated. If it has, a subsequent PEN ON
                results in an immediate trap (provided an ON PEN statement
                with a nonzero line number has been executed).

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      Notes:    With event trapping in effect, Turbo Basic checks for the
                specified event after each program statement. The $EVENT
                metastatement can be used to turn event trapping on and
                off at specified points within a program.