A computer system comprising a server and at least one exam computer (2-1, 2-2, 2-3, 12-1, 12-2, 12-3, 23), the at least one exam computer (2-1, 2-2, 2-3, 12-1, 12-2, 12-3, 23) being connectable to the server by means of at least one data connection (3-1, 3-2, 3-3, 16-1, 16-2, 16-3, 24), an unalterable user profile being saved on the server , the unalterable user profile comprising an exam desktop in the form of an executable file and comprising a configuration data structure in which the exam desktop is specified as a desktop environment to be used, an exam account being established on at least one of the exam computers (2-1, 2-2, 2-3, 12-1, 12-2, 12-3, 23) and associated with an exam to be performed, the exam account being linked to the unalterable user profile , the exam account or a data structure associated therewith or at least one of the exam computers (2-1, 2-2, 2-3, 12-1, 12-2, 12-3, 23) being configured such that the unalterable user profile is downloaded from the server when logging in or after logging in by means of the exam account and a copy (17-1, 17-2, 17-3, 20-1, 20-2, 20-3) of the user profile being saved on the associated exam computer (2-1, 2-2, 2-3, 12-1, 12-2, 12-3, 23) or a storage medium connected thereto, the exam desktop being downloadable from the server together with the user profile when logging in or after logging in by means of the exam account, the configuration data structure being implemented for launching the exam desktop on the associated exam computer (2-1, 2-2, 2-3, 12-1, 12-2, 12-3, 23) when logging in or after logging in by means of the exam account, the exam desktop being implemented such that the programs able to be launched by the exam desktop are limited to a configurable set of allowed programs. an unalterable user profile being saved on the server , the unalterable user profile comprising an exam desktop in the form of an executable file and comprising a configuration data structure in which the exam desktop is specified as a desktop environment to be used, an exam account being established on at least one of the exam computers (2-1, 2-2, 2-3, 12-1, 12-2, 12-3, 23) and associated with an exam to be performed, the exam account being linked to the unalterable user profile , the exam account or a data structure associated therewith or at least one of the exam computers (2-1, 2-2, 2-3, 12-1, 12-2, 12-3, 23) being configured such that the unalterable user profile is downloaded from the server when logging in or after logging in by means of the exam account and a copy (17-1, 17-2, 17-3, 20-1, 20-2, 20-3) of the user profile being saved on the associated exam computer (2-1, 2-2, 2-3, 12-1, 12-2, 12-3, 23) or a storage medium connected thereto, the exam desktop being downloadable from the server together with the user profile when logging in or after logging in by means of the exam account, the configuration data structure being implemented for launching the exam desktop on the associated exam computer (2-1, 2-2, 2-3, 12-1, 12-2, 12-3, 23) when logging in or after logging in by means of the exam account, the exam desktop being implemented such that the programs able to be launched by the exam desktop are limited to a configurable set of allowed programs. <EOS>