is it possible to access multiple database?

is it possible to query data from  multiple database? 

i'm using ms sql server

That's not possible unless you explicitly declare the table name in [Table] attribute as "Database2.dbo.table1". There has been a discussion about it in this topic: http://www.tmssoftware.com/site/forum/forum_posts.asp?TID=3875&title=mapping-classes