[Dovecot] difference between client_limit and process_limit

Hi,

What is the real difference between client and process limit? According 

to documentation (http://wiki2.dovecot.org/Services#Service_limits):

client_limit: Maximum number of simultaneous client connections. If set to 0, default_client_limit is used instead. process_limit: Maximum number of processes that can exist for this service. If set to 0, default_process_limit is used instead.

But what does "client connection" exactly means? Is a user (login)? Is 

a user opens a few TCP connections (as many clients do) are they count as different connections?

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