Can't see computer name but can connect using IP

I was trying to help a friend get a wired router connected up. Cable modem to the WAN of the Linksys with an older G4 iMac (17" flatpanel, 1GHz) and a Mac Book Pro connected to the ethernet ports of the Linksys (BEFSR41).
Both computers on 10.4.7
After setting up a new network location and setting the Built-in Ethernet to use DHCP and making sure the Built-in Ethernet port configuration was turned 'On' things worked fine. I reset the router's admin password by accessing 192.168.1.1 I was able to send & receive mail from both computers and surf the web without any problems. I could login from either computer to the other.
I'm not sure when it happened, possibly after the iMac fell asleep, but eventually I couldn't see the iMac's name when I would Go/Network (Cmd-Shift-K) on the Mac Book, BUT I could still connect to the iMac from the MacBook by entering in the IP. There was no trouble connecting to the MacBook Pro from the iMac
From the MacBook's browser, afp://192.168.1.102/ would connect fine.
Did multiple restarts of both machines, and even powered down & up both the cable modem and the router. Repaired permissions.
Any ideas on why I can connect by manually entering the IP but the computer's name doesn't show up when trying Go/Network???
Thanks.
Patrick

Got it!
I went looking through the knowledge base documents and ran across this document.
"AppleTalk must be turned on both on your computer and the other person's computer, or the other person needs to know your computer's IP address."
I had been able to connect with the IP, but the name didn't show up. I gave her a calll and had her check the Network preferences and AppleTalk was off, she turned it on and everything is working like it should.
Now how do I give myself a 'Solved'?
Patrick
G5 DP 2GHz, 23ACD, iBook, AEBS, iPod video Mac OS X (10.3.9)

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