BPM and e-mail notification

I want to send e-mail to the respective user when a process is queued for his/her Approval in BPM. By clicking the e-mail link, I want the application will take the user to the right place and open the document to be approved/rejected. If the user is already logged in, no log-in prompt otherwise the user will be prompted to login. I know how to send e-mail but the main question here is how can I refer the user back from the link in e-mail to the application at right place with right document opened?

Use Screen Links in your emails. You cannot go the opened screen though, a new browser tab will be opened and the specified screen in it.