Question : Not all computers show up in Windows Explorer: Entire Network\Domain\

For whatever reason, I can't see the majority of my organization's computers and servers in "entire network".  If I go there, via My Network Places, and double click on my Windows AD domain I get 5 (out 35 or so) computers.  By the way, all 5 of those computers are off-site machines.  What gives?  

If I, from my desktop, search the domain for missing computers they don't show up.  If I type in a UNC name in the Windows Explorer address bar, I can get to any machine on the network.  

I need this to work correctly so that my desktop management software will work properly.

I'm running all WinXP machines with Win2k3 servers.  
1 AD domain controller + file server box
1 Exchange server box
1 Sharepoint Portal + Print Server + RAS server box

Answer : Not all computers show up in Windows Explorer: Entire Network\Domain\

you need netbios enabled on all machines for my network places to work, if you want to replicate this info you will need a WINS server installed as well (you have to reboot after enabling netbios)