CompuServe Messages

I'm interested in the SupraTurbo 28 as a stop gap measure (until I can afford a 4000 or an 040 accelerator )to prevent premature ageing while waiting for my stock 2000 to perform complex tasks. I think it would take off some of the pressure even if things went twice as fast I think that would be a real improvement. But, what is this 'pass-through' you guys are talking about? What is the importance of this? Scott