AppleTV, Imac and Networks?

Hi All,
I'm new to the group so please bear with me. I've read other discussions regarding AppleTV connectivity and they have come loce to answering my questions, but not quite. So here goes.
Background: I was running my AppleTV from my iMac 2.16G Intel on OSX 10.4.x with no problems (once I originally got it set up). I upgraded to OSX 10.5 (not a clean install, just upgraded) and had no problems with the ATV.
Problem: I relocated my ATV to another room (within signal range of the iMac) and now I cannot connect to my iMac. The Apple TV did not show in my devices list.
Efforts thus far (ATV):
1. Attempted to connect to Old Library - Failed
2. Attempted to connect to a new iTunes Library - Failed
3. Attempted to connect to a new wireless network - Failed
Efforts thus far (iMac):
1. Re-Create the wireless network [Channel 6 as recommended by a Mac porfessional and 128 WEP encryption] and enter info in ATV - Failed
I don't have a router, wireless or otherwise, other than the cable modem. I'm not sure if I'm setting up the network on my iMac correctly (or securely) if I start opening sharing and turn off the firewall. Any ideas? TIA for the feedback.

Success!!!
I guess it's all a matter of semantics. Wireless Network vs. Sharing Services Wirelessly.
After attempting to connect my ATV to a wireless network created in the System Preferences - Network pane, and failing miserably yet again, I took a deep breath, regrouped and tried to figure out what was going on. On the Sharing pane in System Preferences, my option to share my Ethernet based internet connection via AirPort was grayed out. Checked as active, but grayed out. I thought to myself; "Self...maybe your problem lies somewhere in sharing vs. networking."
But how to give myself the option to get to the "advanced" button which was also grayed out. I unchecked, or turned off, internet sharing and suddenly, AirPort, Ethernet and Firewire rejoined the real world of selectable options.
Selecting Airport and venturing to the previously unavailable "advanced" button, I found what I had been calling a "Network". All the juicy information my heretofore unconnected ATV needed. I entered the "network" name and password into the ATV and VIOLA! (not the musical instrument, but the boisterous exclamation of glee and joy) Entering the 5 digit pass code into iTunes and I connected instantly.
Almost as fast, my ATV disappeared from the Device list, but I did not despair. I had come this far and would not give up. Returning to the ATV, I turned on Synching. Apparently this tells the iTunes that a constant connection is desired and says "Hey! Keep me in your devices list!" As seen in the harrowing tales of others, I also ensured that my iTunes and iPhoto libraries were shared using the appropriate preferences and there have been no problems since.
The Moral of my story is to connect your Apple TV and your Mac using Internet Sharing via Airport, and NOT by creating a new wireless network. I can't speak for those using separate networking devices or using Windows boxes. This is just for one Mac to an ATV.
So hopefully, the tale of my quest will help other adventurers as they explore the realms of Apple TV.
Good luck to all and many heartfelt thanks to those who have helped me on my way to success.
Cheers

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AppleTV sync and Network home directories

I am unable to see the AppleTV device in more than one location, using the same login account.
I have an Xserve that contains user accounts in Open Directory. This Xserve also manages user home directories. This allows me to log on to any machine with the same account and get to my home folder. Do not confuse this with what I believe is called Mobile accounts where the home directory is copied locally to each machine and is kept in sync with the server. Once I log out, nothing remains on the client machine.
So, turned on my AppleTV, logged into my Xserve since it was not being used. This account is also not "local" to the Xserve, i.e. not under /Users/. Launched iTunes, saw the AppleTV, typed in the 5 digit code, and watch the AppleTV sync. OK, no issues. Logged off the Xserve. Logged onto the desktop using the same account I just used on the Xserve. Launched iTunes, no AppleTV listed. Not cool!
Is AppleTV restricted to syncing to one computer, one account, one ip address, or one MAC address? If it is one computer how does it know the different machines?

Thanks folks for the comments but I don't believe I am coming across correctly.
Patience this is a bit compplicated
Infrustructure:
1. Xserve1 running Open Directory, managing multiple client computers and users to include user home directory location via Workgroup Manager.
2. Xserve2 handling 7 Tera Bytes of home directory storage. Repeat 7 Tera Bytes of home directory storage.
3. Many Mac desktops running 10.4.10. Only one local account, we'll call him local-admin on any of these machines which is the local admin account for that machine. Absolutely no other information for users resides on these machines.
When User1 logs onto Desktop1, Desktop1 makes a query for information from Xserve1. Xserve1 response saying the login is correct and that User1's home directory is located on Xserve2. User1 is now logged into Desktop1. Open a Finder window and if you did not know any better you would think User1 was a local user to Desktop1 because you see in Finder on the left column you have the standard items appear such as a "Home" icon next to the username, Desktop, Documents, Movies, Music, etc display. Click on anyone of them and you are in the proper place. User1 loggs off of Desktop1.
User1 now logs onto Desktop2 for whatever reason. Maybe Desktop1 was being used by User34. Desktop2 repeats what Desktop1 did. Makes the call to Xserve1, mounts the home from Xserve2. If you were to go back to Desktop1 you would find no trace of User1 except maybe in log files. The only user listed in MachintoshHD -> Users or in Unix terms /Users would be local-admin. So User1 is the only user and the iTunes library located in User1's home directory is the only library being dealt with.
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User1 loggs into Desktop1. Types in code to lock Desktop1 as the syncing source for User1's library. What was not initially understood was AppleTV also is locking Desktop1 as the streaming source for User1's library. You will see in a moment how I found this out. User1 selects the Photos to sync, turns off Movie syncing, selects Music etc. Sync finishes. AppleTV can play content can switch to streaming source and play the videos. User1 logs off Desktop1 and AppleTV acknowledges this by greying out User1's library as a streaming source.
User1 logs into Desktop2. User1 notices AppleTV still shows User1's library is greyed put as a streaming source. Shouldn't that no longer be greyed out since it is the same library? OK, lets add Desktop2 as a New Additional Streaming source. Types in the code that AppleTV displays on User1's library on Desktop2. The Sources screen on AppleTV now changes slightly. The new streaming source is added below a white line. The AppleTV source is still white letters and the original streaming source above the line is still greyed out. The new streaming source is selected and content is viewable. User1 logs off of Desktop2. The new streaming source greys out as expected.
User1 logs back into Desktop1 to sync some more photos to the AppleTV. Desktop1 is used since that is the original syncing computer. iTunes is launched. User1 waits, and waits, and waits. The AppleTV device never appears back in iTunes. Checking the AppleTV, all content is gone. User1 logs back onto Desktop2 to see if streaming still works. Nope, streaming no longer works.
Spent almost 2 hours on the phone with Apple support. Nice bunch of folks. Spoke with multiple tiers of AppleTV support and even had a gentleman on from the Enterprise Division on the phone. They are elevating this up higher and promise to get back with me. Hoping.
Complicated, yes.
My thoughts on how to solve this, don't lock the device to a computer, lock the device to an account for syncing. Also, don't automatically lock a streaming source when locking a syncing source.

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I'm glad you got it all working. Out of interest, how do you (or your son) connect to the internet now? Is it just a dial-up connection? If it is, I am sure you know that, even if you get the Apple TV to share the connection, the speed will seriously limit the use of many of the Apple TV's features.
The Airport Extreme is a great router but you will need a DSL or cable modem as well as it won't connect to the internet without one. There are many great (and cheaper!) combined modem/routers available if your son wants to get a high-speed network up and running at lower cost. Any other computers, phones, games consoles etc that you may have in the house can then all connect easily.
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Also, I didn't want to bridge TC with my new fios router that I paid 100 dollars for, to get N speed and also paying 10 dollars more a month for fast speed. I heard that bridging slows down everything and then there can be port issues with mail etc. I connect to the internet via airport only and it is pretty fast. Getting over 50mbs downloads and over 30mbs uploads. Plus everything in my home it connected to my fios router, airport express for music streaming, two apple tvs, vuezone camer system. I really didn't want to monkey around too much with my system. But are there other options to connect the new TC. Can't find info anywhere for this and called apple who gave me the info above. after hanging up, i see that i cant access my TC and I am wondering if i would have to reset it to turn wifi on again to make changes to the drive, turn off blinking light or repair it in disk utility if it should become corrupted.
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Now a rant. I can't believe in this wireless age that Apple would make a product that cant join a wireless net work. The apple rep said i could return it and look for the previous TC that would join an existing wireless network. Are we going backwards?
Thanks!
lennydas

Ok... it is getting a bit clearer but there are still some questions.
I connect to the internet via airport only and it is pretty fast.
I was assuming airport in this statement in your first post meant the TC or the Express.. but I now realise we are still in the mass confusion stage where apple calls everything wireless an airport. So what you mean is the airport internal card of the computer??
Also, I didn't want to bridge TC with my new fios router that I paid 100 dollars for, to get N speed and also paying 10 dollars more a month for fast speed. I heard that bridging slows down everything and then there can be port issues with mail etc.
I think this is mistaken.
Putting the TC in bridge mode plugged into your FIOS will not slow the network.. nor will it cause mail or port issues.. in bridge the TC is just a fancy WAP and switch plus the network hard drive.
If the computer is close it will be faster than the FIOS.
You can run both wireless networks with different names.. so it is clear which is which. But you can also setup roaming so the computers themselves pick which is the best wireless.
I tried extending the wireless net work and tried joining wireless network, but the TC kept crashing and I had to keep resetting the TC. the Apple support person said these, extend wireless network and joint wireless network, are no longer a connection option with the new TC because of the new AC protocol.
Thanks again!
You cannot extend to a non-apple wireless router.
You cannot use join a wireless network because when you do the ethernet ports will be cut off.
But that has not changed.. I don't think Apple support is correct.. there has been no change with the AC model.. it is simply a fact that apple routers do not work in join wireless mode other than as a dumb client. The same applies to AC as to the earlier version.. but I have asked another person to check this.
Join in the express is the only apple router that still allows an ethernet connection.
For now you best use of the TC is bridged to the FIOS. Wireless you can sort out between several options.

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Hello krosebear,
Thank you for using Apple Support Communities.
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If your iPhone, iPad, or iPod touch won’t connect to a Wi-Fi network - Apple Support
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AppleTV, Imac and Networks?

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