Port question

A bit random, but what do the following do:

[ ] Use UPnP Port Mapping
[ ] Use NAT-PMP Port Mapping?

According to http://tools.slsknet.org/porttest.php my SoulSeek is configured correctly, I have UPnP on and NAT-PMP off. What would be the advised setting, however?

Any advice would be really greatly appreciated. Many thanks.

bump

If you're manually forwarding your Soulseek ports then you don't need either. UPnP and NAT-PMP attempt to automatically configure your router to open those ports. The latter is a Mac standard and used by AirPort routers.