PEEK is a utility program designed to operate under the ITS time sharing system. It enables a user to monitor a variety of aspects of the time sharing system by providing periodically updated display output or periodic printer output to teletype or line printer. just what information is being presented to the user is controlled by PEEKs information mode. The available modes are listed in section 3 below. Section 5 describes how PEEK determines which device to output on. Section 2 describes, in general, how the user can input commands to PEEK.