... as a student identification card
A student identification card (chip card) will be made for you as soon as the payment of your semester fee for your first semester of studies is recorded by BTU. 

You need to register for every semester of your studies. Please check out the following information on registering for the following semester. Following your registration for each semester, you need to get a stamp of validity on your chip card. This can be done in the main building, room 0.27 at self-service terminal 1 or 2. This stamp also updates the validity of your semester ticket.  

... as a ticket for public transportation = semester ticket
The use of the card as a ticket is possible in all of Brandenburg and Berlin, and on the RE 18 train to and from Dresden's main station (Hauptbahnhof). Every time you pay your semester fee and print the validity stamp (Gültigkeitsdruck) on your chip card in room 0.27 of the main building at self-service terminal 1 or 2, then you are also updating the validity of your semester ticket. 

... as a library card
With the chip card you can borrow books from the university library (IKMZ), do research on the internet, access databases, and access electronic media. Find out more about the library card function here. 

... as a copy card
You can make copies of documents at copy machines located around campus and in the IKMZ with your chip card. The chip card has a "wallet" integrated into it which you can load money onto using cash at the loading machines located in the main building and the IKMZ (the loading machines are located near the building entrances).