To enable students to get started quickly when they come to class, set the default homepage for their browser to point to a webpage they’ll need to access during class. If you have multiple sites they’ll use, consider having a shortcut for each one on the desktop.
Example: "Type in your login after you open your web browser!"
See this and related tips as a Tip Sheet: http://csteachingtips.org/tips-for-lab-rules