Editing Domain/OS (section)

===User interface===
AEGIS is similar to other workstations of the time, in that it uses a high-resolution graphics screen and mouse to provide a [[Graphical user interface|GUI]] named DM (Display Manager). DM is integrated with the [[operating system|operating system's]] own [[window manager]] known as '''wmgr''' (Window Manager). The DM contains two built-in functions, a [[text editor]] and a transcript, which is a kind of [[command line interface|virtual terminal]]. Additional functions can be added by user programs. One of the unique features of the DM is "universal editing". All text in any of the built-in windows can be edited using the same editing language. This includes the history displayed in a transcript window, although that text is read-only. In addition, the history is unbounded. It starts from the birth of the process to which it is attached, and older history is never deleted. Each transcript is attached to a mini-input window where the process input can be edited using the same editing language used elsewhere.

The AEGIS command interface is similar to [[Unix]], in that it has a [[command line interpreter]] which understands [[pipeline (software)|pipes]], [[redirection (computing)|redirection]], [[Scripting language|scripting]], etc., and invokes other commands as separate programs, but the actual commands themselves are designed to be easier to remember and use than their Unix equivalents, and [[Wildcard character|wildcards]] are expected to be expanded by individual commands rather than by the command line interpreter itself. The user may embed [[environment variable]]s in [[symbolic link]]s, which, for example, allows switching between different versions of Unix by setting the SYSTYPE environment variable accordingly; symbolic links then point to the appropriate versions of the files.