How does android decide to cache a process

In Gingerbread Settings->Applications->M开发者_StackOverflowyApplications, the Running tab has been divided into two. Running Services and Cached Background Process. So how and when does Android decide to cache a process? Mainly is there anything my app can do to tell the system to never cache my process? Thanks KK

It seems like someone (or you?) cross posted the same question from Android Developers forum. Relinked answer from Mark Murphy for others' convenience.

I think Android keeps track of the process that are been frequently been in use of different components and different apps and cached them.