At least one basic program and an auxiliary program run on a computer and collaborate with the computer via an operating system, with windows being displayed on a viewing device allocated to the computer. The auxiliary program determines a basic window pointer on the basis of an identifier that is characteristic of the at least one basic program, the location and size of the basic window on the viewing device being able to be set via the basic window pointer. The auxiliary program, based on this pointer, sets the location and size of the basic window to values determined by the auxiliary program.