Abstract: Certain multiple user functionalities are provided in connection with the usage of various computer and Internet applications in a personal computer system designed for single user usage. Duplicate sets of user input devices such as keyboards and mice may be provided. Two or more users may utilize the duplicate sets of user input devices to control a single set or duplicate sets of input markers (i.e., cursors and pointers) on a common display screen. Priorities may be assigned to certain user input devices or groups of user input devices to avoid conflicts. The priorities may be assigned automatically or assigned manually by a user.