Difference between motion on part vs joint?

I have a question about best practices of adding motion to anassembly in CosmosMotion 2007. In SW (w/o CM), a physicalsimulation motor will be mapped to a part motion using CMIntellimotion Builder. This is useful so that if my client does nothave CM, at least I can show the motion using physical simulation.

I have noticed options exist in CM to add motion to the joints aswell as the parts. It appears that adding motion to joints isalmost the same as adding motion to the part. What is thedifference, and why should I add motion to a part versus motion toa joint? Other than the physical simulation being mapped, does onehave an advantage other the other? Is one easier to trouble shootthan the other?

Also, should hardware be added to linkages, such as pins, shoulderbolts, etc? If not, how do you keep the parts assembled during thesimulation in CM? In CosmosWorks, it is necessary to define contactsets for FEA. Is it the same in CM?

Where can I find a tip sheet / check list of best modelingpractices for CosmosMotion, and ? I have mostly used just physicalsimulation in the past, so I am new to CM?
SolidworksMotion Studies