In a microflow you have access to the session.user object. You can then cast this into an Account object using an inheritance split. I hope this answers your question since it is quite difficult to understand what you mean exactly.
Don't confuse microflows with workflows. When I started with Mendix I made the same error. A microflow is like a function, it cannot stop. To create a approval workflow you will need to combine several pages and microflows. You should start with an entity that has a status attribute, with microflows you can alter the status of your object and in that way start creating a workflow. Hope this helps :-).
Thanks Charles Bronzwaer!
I got the process Approval as well as Pending as Status .How Can i get The count Of No of Approved as well as Count of Pending..