Live Chat issue
We have live chat link set up inside of an iframe, the pre chat form also opens inside of an iframe.
We do not want the user to enter any values in the prechat (default ones being Name and email address as delivered by SF) – is there a method to pick up the user ID and auto populate the prechat and send the values across to the receiving side. If there is an existing case ID, the user will enter that on the prechat form and we expect to open up the same case number on the agent side.
We want to open a new case on the agent side if the user does not enter existing case # on the prechat form. As soon as the user clicks on submit on the prechat form, we expect to open a case on agent side with prepopulated values like contact, Case origin, Case record type for User name  in  standard case page using  User ID (though the user does not directly enter these on the prechat form). At a later stage, the case transcript will get added to this case once the chat completes.