Is there an equivalent to OPENROWSET in Oracle?
Answer provided by John Eisbrener in a comment

The effective equivalent is a Database Link.  Sadly there's not an identical equivalent to what OPENROWSET does in one Oracle command or statement.  You have to declare the db link first before accessing it.  If you don't want to edit a tnsnames.ora file, you can create the dblink using an in-line statement, which allows you to programmatically emulate OPENROWSET functionality.