Unassigned Ports

I am running a win2k server and ran a portscan on it the other day to see if anything strange was happening. I came across these two ports which are unassigned to any specific function according to the IANA port list.

1002 4923

Just wondering if anyone knew any specific programs which use these ports or any way I could find out what programs were using them.

Thanks in advance,

-toad