Fabian Suchanek's Class Notes (His homepage) An amazing collection of class notes on almost every CogSci course. Scroll down a little to find the courses from Osnabrück.
The CogSci computer lab is in 41/B10. You need an access card to get in, but during the day you can often get in by knocking.
B10 access cards are given by Beate Eibisch. Only go during her office hours! (Sprechstunden) But, you do not need an access card to have an account in B10.
Create an account in B10 (You must already have an account from the Rechenzentrum. If you have a univsersity email account, then you have a Rechenzentrum account.)