Multi-database Join?

[Tim Howell]

Is it possible to execute a join across tables in multiple databases?  I
have employee info in a table in one database that is mapped to
information in several other DBs by EmployeeID.  I have no idea if SQL
has any way of supporting this, or if such support exists in DBI.
 
I'm using DBD:MySQL.
 
Thanks!  =)
 
--TWH