I want to delegate task manually through form or seperate workflow. 

In Tasks SMO paramters are mentioned like :- 

ProcInstID 
Actid 
Actinstid
ActInstDestId 
Eventid 
ActionName 
ActionerName 
ActionerType 
Destination 
Execute

Can anyone knows from which join table i will get all this data. Specially i am confuse between ActionName, ActionType, Execute.