Usage of an EPICS word

["jun-ichi.odagiri--- via Tech-talk" <tech-talk at aps.anl.gov>]

Hi, all

In the previous mail I wrote, I called "CAS-TCP" a "general purpose 
thread".
Then, Ralph corrected it that "CAS-TCP" is a "core thread".
Now, I understood what "core thread" means.
What I do not understand is, then, what "general purpose thread" means.
Could anyone teach me what "general purpose thread" means?

Thanks a lot in advance.

J.Odagiri at KEK