Instantiator CGI in workflow

spayal

I am confused with instantiator CGI.

I tried to go through PDF, but could not understand where does a user interact with instantiator CGI.

When I click on "submit" button after finishing a work on template and a form comes up to select a workflow, upon selecting workflow, form comes up to enter comments. This form is asking to enter comments, is this produced by instantiator CGI ? if not, then what is done by instantiator CGI that user interacts with ? Because after the comments are submitted and "Run Job" button is clicked, task in the workflow starts.



Pls explain.