View Site Link, please

I am new to WP, so hope this is not a dumb question.

When I am working in the admin area, I cannot easily view any changes I make to my site. Equally, if users visit the dashboard – say, to view their profile – there seems no way of returning to the site itself. So far, the only way I’ve found is to open up the ‘pages’ section in the admin UI and then click (next to a page) on the ‘View’ link. Is there a means of adding a some sort of link in the header of the admin area which stays permanently visible/usable whatever sub-section one is working on?

TIA