[hasherfrog]

Q. How can I connect two PCs via USB?
A. Every USB communication is between a host and a device. The USB support included in every PC is for a USB host. To connect two PCs via USB, you can do any of the following:

1. Buy an EZ-Link or similar USB bridge device. These devices contain two USB devices. Each device connects to a different PC. Data sent to one device is passed to the other device, which sends it on to the other PC. The connection typically appears like a network connection between the PCs.
2. Connect a USB/RS-232 adapter to each PC and connect the RS-232 ports in a null-modem connection. Use COM-port functions to communicate.
3. Install a device card in one PC. An example is PLX Technology's (formerly Netchip) NET2280EVB Adapter Card. The PC provides the driver software for the device.
4. Control a USB device from a parallel port on one PC using the DevaSys USBLPT-PD11.
5. Some Windows CE PCs can function as a host or device.