How to find which IP is connected to which network switch port

I’m trying to find a way to find out on my 3Com 4400 Switch which IP address is connected to which port.

This will save me a lot of time trying to go to each computer or network device to plug/unplug the cable to check which port it’s on. As i’m only working alone, I have to depend on the user willingness to help out in the tracing.

Is there any software or something I can use to check the IP belongs to which switch port?