[Samba] Samba serving port 445

[ltiu]

Hello guys,

I've surfed the internet with no direct answer to my question (mainly because 
I am clueless, sorry).

A have Samba 2.2.2 running with port 139 open. I can mount Samba shares with 
mount  -t smbfs  -o username=xxx,password=xxx  //x.x.x.x/share  
/mnt/mountpoint  from another Linux box.

Using tcpdump, I can see my family's XP Windows box client machine trying to 
connect through port 445. What's going on here? Is Windows file sharing using 
port 445 now? How do you set Samba to serve off port 445?

Thanks for any help. Anything at all to get me started....

ltiu