How to create ClickLink, FillOutForm, VisitWebPage activities

[Anonymous]

I'm trying to understand what each activity type is from the list of the activies defined in the Marketo web service WSDL.
Is there a document or article which describes how to create these activities ?

I'm particularly interested in the activites ClickLink, FillOutForm, VisitWebPage. Is there an article on how to perform these activity types.

[Anonymous]

The activities are created by Munchkin.

The WSDL, effectively getLeadActivity, is intended to retrieve that information.