X has a notion of window properties, which live in the X server. X window properties are often used to implement protocols between applications and the window manager, which can have several levels of standardization, from official X standard, to standardized by some other organization, to made up informally by groups of programmers, to specific to one window manager, to specific to an individual, or installation. Scwm already internally implements many of these protocols, including all X standard protocols, as well as the Motif and Open Look protocols. However, the user should be able to implement any of these he likes, including making up his own for personal use. This is possible through the low-level X property interface. Scwm has one procedure to get, and set them, respectively.