In order to avoid unnecessary and/or too shortly displayed wait window information occurring when a program is run on a highly performing hardware it is proposed to check whether a task which causes the display of the wait window information has completed after a predetermined first time interval after start of the task, and not to display the wait window information if the task has already completed within the first time interval, and otherwise display the wait window information at least during a predetermined second time interval, even if the task has already completed within the second time interval. Advantageously, the features can be implemented into an operating system. The advantage is that the flickering appearance of so-called wait windows is avoided.