Your documents will be formally checked by uni-assist e.V. and, if complete, delivered to the university. You will be informed about the delivery etc. by uni-assist e.V. by e-mail. The applications will then be reviewed and evaluated by the department's examination board. The evaluation ultimately results in a ranking according to which admission is granted.
For degree programs with restricted admission, the letters of admission are usually available via the university portal about four to eight weeks after the application deadline.
If you have not been admitted in the main procedure, you have the option of still being admitted through a possible follow-up procedure (Nachrückverfahren). You will automatically take part in the follow-up procedure if there is one and you have not been admitted in the main procedure.
Rejection notices are only to be issued after the conclusion of the entire procedure (usually end of September/beginning of October or end of March/beginning of April) via the university portal.