persistence on windows workflow foundation

Question

hi everyone:

I been a .Net fan from more than two years and I started to experiment with WWF I know that this technology is not that new but in my research I discovered that are a lot of differences from the framework 3.5 to 4.0 and I cannot figure out how can I implement the persistence of  a current workflow, how does visual manage this operation and how can I implement it

I'll be very greatful if any of you can explain  me this or send me a link where I can learn more about it

I'm not that good with English sorry if somethings are not that clear

Thanks,
Carlos Pammo