The files stored locally on the computers in MBH 635 are only available locally on that computer and may be erased at some point. For all of your code, etc. you should store the files on middfiles.
To access middfiles from the lab computers go to an explorer window (for example, go under the "Start" menu and select "Computer"). In the navigation bar at the top go to:
\\middlebury.edu\middfiles\home\You should see a set of folders for different letter ranges. Double-click on the folder that has your username range (not your last name). You should see a folder in there with your username. This folder has all of your files stored on middfiles.
You should get in the habit of storing all of your files, programs, etc. on middfiles for this class.