Steve,

Not without an external device, like a relay. You could use the RTS line, for example. See http://www.tisd.net/~harveybppp/relay.html for a hint.

>How would I use the mscomm control to complete a simple circuit? I have some experience with using the mscomm control to send & receive.
>
>Could I use it to complete a circuit?
>Essentially turning my pc into a toggle switch.
>
>What signal would I have to send and which two wires would I need to tap into, on a standard 9 pin com port?