Object and its shadow on a separate pass

[Greggers]

Hi guys,

Could someone please advise or point me in the right direction as to find out how I can render and have separate passes for the object(s) so I can control them/it In photoshop afterwards.
For example - Not an object or surface id pass, but where I can have a render without a certain object then be able to have a separate layer with that object on and its shadow cast within the scene so I can adjust it apart from the rest of the render afterwards in photoshop? Im sure I saw a tutorial somewhere but i cant seem to find it.

Thank you
Gregg