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29.17 Side Windows

Side windows are special windows positioned at any of the four sides of a frame’s root window (see Windows and Frames). In practice, this means that the area of the frame’s root window is subdivided into a main window and a number of side windows surrounding that main window. The main window is either a “normal” live window or specifies the area containing all the normal windows.

In their most simple form of use, side windows allow displaying specific buffers always in the same area of a frame. Hence they can be regarded as a generalization of the concept provided by display-buffer-at-bottom (see Action Functions for Buffer Display) to the remaining sides of a frame. With suitable customizations, however, side windows can be also used to provide frame layouts similar to those found in so-called integrated development environments (IDEs).