> Also I've seen use a rinse before but not between I've seen no rinse before but rinse between I have a book that says "DO NOT RINSE UNTIL AFTER THE DEVELOPING PROCESS" or words to that affect.(posted 8173 days ago)Absolutely do _NOT_ rinse between step A and step B. In a true divided developer, the developing agent has soaked into the emulsion in step A and step B "activates" it.
Most recommended divided developers really aren't divided; part A is a relatively complete developer (D-23 for example) used for a shorter-than-normal time and part B is an accelerator (borax, kodalk etc).
> I've heard no agitation is needed I've heard only a tiny bit is needed I've heard agitate it like you normally would in a tank with a single bath Will this make a difference in the contrast?
You'll most likely need to give "normal" agitation in step A and normal to continuous agitation in step B in order to get sufficient development evenness. What kind of agitation you give of course will affect curve shape; most likely if you give sufficient agitation for good evenness the curve shape will actually be virtually no different than if you'd used the "complete" developer to begin with.
> I heard the film speed makes no difference. Can I shoot Tri-X at 200,400,800,1600 and develop all four rolls at once and get good results?
Nope, it doesn't work that way.