A computer system receives a command to initiate setting a display mode of its corresponding display screen to one in which received input commands (e.g., mouse input, keyboard input, etc.) are directed to multiple display applications running on the computer system instead of only a single display application in a foreground (e.g., a "topmost" window presented to a user) on the computer display screen. For example, based on input from a user, an auxiliary application herein receives an identification of at least a first display application and a second display application that each display information on different respective windows of the display screen. Thereafter, the auxiliary application duplicates received input commands and forwards the received input commands to both the first display application and the second display application, alleviating the user from having to separately apply the same commands to each of the first and second display applications.