Re: Steves 935/DTC question: I'm reading this from out of town, so can't supply specifics right now..however.. I assume you have an application running on the 935 which is opening the port to communicate with the HH PC's .. (what brand/type?). If that is the case, you might try fopen on the port, then use fcontrol to set port behavior to switch to transparent mode. Sorry I don't have specifics. The definitive source for answers to questions of this type would be Ross Scroggs and the folks at Telemon. They always seem to give the correct answer the first time! Joe