The answer is "YES" to both questions - there is loads of info on here about it.
The connector is a com port but more usually called a serial port these days. What you are looking for is a USB to Serial cable. (I think "keyspan" or something is the one that works but look in the Pronto FAQ on here first for the info!
Stoobie
RC9500, RC5400, RU940 & Pronto Neo, Windows Vista.