Can others access my computer on a public or private wifi network?

[jaybird]

If I access a public wifi network (or maybe a wide open private one) is there any way someone access files on my system? If so, how do I lockdown my system.

I have one directory that is shared and it's not root.

[cszeto]

http://forums.practicallynetworked.com/showthread.php?threadid=2077