I have some questions for the gurus here at planet Z...

I'm not sure how everyone else has linked their projects together but my projects revolve around:
Pulsar 2 MIDI A Source (MIDI in on Creamware card) - Sequencer MIDI Destination (Cubase, Logic, Sonar etc...) &
Sequencer MIDI Source 1, 2 etcc - Pulsar 2 MIDI A Destination. My question is about Pulsar 2 MIDI A Source and Pulsar 2 MIDI A Destination -
Does a MIDI B source exist? - And does a MIDI B Destination exist?