matt,
        good way to emulate a press button switch from a Pic is to interface a
4066 device. Each DIP 14 package contains four switches which can be
directly controlled via the Pic using either spare portB pins or if
these are not available using Peek& Poke on portA Don't forget to hold
the relative pin "high" for a sufficient period of time to mimic a P.B.
switch. Bias the four control lines to ground via 10K.
As each pin is taken high the switch will close.