K2.net & MS Share Point Port Server Relationship

Hi, I am new to K2.net and my company is evaluating the feasibility of posting webform (from InfoPath) using K2.net. I have the following queries, hope somebody can help.

1) Do I need the MS Share Point Portal Server? If so, what's the relationship of SPS and the K2.net ?

2) I dont know the flow to post the form in the K2.net, can anybody briefly describe? Or where can I get such information.

Thanks a lot.