usb functions

Greetings,
I am currently employed by a laboratory conducting research in visual
attention. We would like to connect an eye-tracker to a computer such that
eye position can be correlated to the position of objects on a screen.

Is there a function in any version of psychtoolbox that enables matlab to
locate and/or recognize a device plugged into a usb port(mac or pc)? Any
information on this subject would be greatly appreciated.

thank you very much,
charlie king