Hello Tom, With the information you provided, which was excellent advise, I realized what my problem is, and I don't know how to solve it, if there is a solution.
I have 2 iMacs; one is "the main" one up in my study, and the other one is my "music" iMac which is located where the living room and terrace is. This particular iMac does NOT have APPLE ID as I download all music, etc from the STUDY iMac. Now, the AppleTV is connected to my TV set on my terrace and the closest iMac happens to be the "music" iMac.
OK; so if I select "Home Sharing" on the "music" iMac it will not locate the AppleTV as the AppleTV picks up my "Study" iMac. But then, AirPlay will pick up what is happening on the Study iMac, which I don't want.
I would like to be able to connect the Music iMac to the AppleTV without an Apple ID if at all possible or will I have to "bite the bullet" and obtain an AppleID for the "music" iMac also?
If I have to, can I SHARE the photos from my Study iMac [which does have an AppleID] to the AppleTV ...... and ONLY share that? I don't happen to be too wild about the iCloud.
Hope I'm not troubling you too much with all this.
Richard