A group of windows can be given the semblance of one window and yet offer the advantage of different windows; for example, text can be displayed next to an object the text describes. The author creates this effect by defining a window that consists of:

• h1. or :h2. primary-window heading tags, followed by automatic links to secondary windows. (Text is not allowed.)
  
• h2. secondary-window heading tags, each followed by text.

The primary window and its secondary windows must reside in the same file.

The position and size of the primary window determines the boundaries for its secondary windows. If the position and size of a secondary window are defined in absolute values that exceed the perimeter of the primary window, the secondary window is clipped. (When a window is clipped, part of it lies outside the window boundary and cannot be viewed.)

Sizes of secondary windows can be defined as percentages of the primary-window size. The minimum size of a secondary window (expressed in percentages) is zero height by zero width. Negative values for origin and position are not allowed.