Mesh Setting >>> h / p adaptive ???? ( URGENT )

Dear Cosmos users....

1. Any body can explain to me about deafault mesh, p-adaptive mesh& h-adaptive mesh ?
2. When we use default, p or maybe h-adaptive ?
3. What is the effect of each mesh setting ?

Thank you .....

-DD
SW 2007 off premium sp2.0
cosmosworks designer 2007SolidworksSimulation