Cooperative processing is computing which requires two or 
more distinct processors to complete a single transaction.  
Cooperative processing is related to both distributed and 
client/server processing. It is a form of distributed 
computing where two or more distinct processes are required 
to complete a single business transaction. Usually, these 
programs interact and execute concurrently on different 
processors. Cooperative processing can also be considered 
to be a style of client/server processing if communication 
between processors is performed through a message 
passing architecture.