I'm looking for an inexpensive utility to show me what program or process has taken control of a com port. I have a Fujitsu laptop (with port replicator-- since there is no access to the external serial port on the laptop itself) and need to use com1 for a proprietary program that communicates through the serial port.
The external serial port is correctly set to com1 in bios. However, when I use hyperterminal to test the availability of com1, it says that com1 is already in use. The internal modem is using com2 (I've also tested with modem as COM3). When I change the external serial port to com2 in bios-- hyperterminal behaves as expected-- it takes control of com2 and transmits data through the external serial port.
Bottom line-- some process that I can't identify has control of com1, and I need to figure out what process this is.