on non-blocking perform interaction

A short follow up on today's discussion on this topic,

Mike is right on that a producer does not have to do anything in this 
method, a NOP is enough. However the producer must stop portlets from 
creating non-blocking action URLs. And on the consumer side, the 
consumer must handle non-blocking perform interaction calls as it does 
not know if producers/portlets will create non-blocking action URLs.

Alejandro