I am looking to track multiple domains and I have been reading about the asynch code that makes this possible. Before moving forward though i have a few questions that i hope someone can help with.

1) is there a max number of domains that i can track? I am looking to track 400-500 domains

2) will this multiple domain tracking code interfere with other GA code that is running on the domain (most likely these domains use the traditional code)

Thanks in advance