The Permalink function can be accessed from the Planisphere, Planet round-up and Solarsystem views.

In the lower left corner of the views click the link icon to generate a permalink.

A permalink contains all the information required to restore the current view as it was when the permalink icon was clicked. You can use it to share a specific view with others, and it will guarantee that they will see the same view as you had at that moment, including the time and date, your settings and sometimes your location if required to recreate the view (when using permalinks from the planisphere).

All information required to restore the view is stored in the URL itself, this unfortunatly results in rather long URLs, you can use a URL shortener service to create a shorter URL, for example the Google URL Shortener.