0 - 3 of 3 tags for sessions

Hi Experts,
Are there any differences b/w the multiple sessions that are invoked through BTEQ and loader utilities.  If so, what are they.
eg:

Greetings Experts,

What is the basic difference between the instances and sessions in TPT.

If I declare a Maxsessions attribute for a operator to be 10 over a 10 AMP system, and the consumer operator uses all 10 sessions (as producer is able to keep the consumer busy)

I have SQL that needs to run some preprocessing creating a volatile table to be exported to a file. If I use a setup step TPT is using a different session for each step and the volatile table goes away. Anyone have a work around?