Sync multiple iTunes libraries on one ATV

Is it possible to sync the itunes libraries from my two macs onto one appleTV? The libraries are unique.
When I try to switch source to sync....ATV says I will replace the contents from the previous sync with the contents of the other mac.

I don't have an ATV yet (should be arriving any day now), so I can't test this, but at the very least you should be able to stream from two different iTunes libraries on the same computer. This article mentions doing it:
http://docs.info.apple.com/article.html?artnum=305287
Apparently when there are multiple logins with multiple instances of iTunes running on the same machine, they use additional TCP ports that would normally get blocked by the firewall, if it's turned on. Maybe you've got the firewall turned on, and it's smart enough to open a hole for the standard iTunes port (3689) but not the extra holes for additional users (49152 and above).
24" iMac   Mac OS X (10.4.9)  

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