You can use the computers in the computer lab (E2115A). If the door is locked, use the door code located on the class wiki page (code: 0216354). If the building doors are locked, go to the north-west corner of the building and enter the door code that is also in your notes. If you don't have the codes, contact a classmate and ask them. Dr. Herr will be in his office before classes on Tuesdays and Thursdays to open the classroom (2121 B) if necessary. His office is located through the door past 2121 B.