opmnctl registerinstance
opmnctl unregisterinstance
opmnctl updateinstanceregistration

Save some time here
Rejoin/rejoining/register EM (enterprise manager) / fusion middleware control or console

Googled high and low and yet the terms used in doc still beyond my common sense guess.

Full load of certificate crap

When will these vendors realize that 50% (if not 90%) of the problems with federation product implementation is from certificates..create/add/modify/delete/associate/whatever
If you don't make this steps clear and easy it's gonna be a pain in the ass...
Redirecting users to openssl, 3rd party CA is okay, as long as you document it properly!

Some instructions ... probably Swedish


Koka upp vatten, olja och salt i en kastrull
Ta kastrullen frän plattan
tillsätt couscousen och rör om
lägg på locket och låt stå i ca 5 min
Rör om couscousen lätt med en gaffel. Smaksätt gärna med något av tipsen