OMI process definition

Dear All

I want to know process listed below is responsible for what aspect of OMI

OMI DPS processes  :   bus, odb,  mercuryAS,  marble_supervisor,  businessImpact_service,  OPR-SCRIPTING-HOST, OPR

OMI GW processes : odb, mercuryAS, schedulergw, wde, OPR-SCRIPTING-HOST

Can someone advise.