Ones Windows sharing aka your computer. The other is OC is WLOC sharing config newer builds of wloc will give you a choice from what I'm told either leave it as is or use wloc print sharing
wloc print file sharing I think is better because it's protected network device through wloc.
Selecting wloc print sharing will disable windows sharing if you ok it I'm told too.
You won't see 2 of the same printers and stuff.
If you have a media center pc or vista you'll even see the media connections too.