This implies that the terminal is normally operated with the margin-wrap switch turned on, and the normal description of the terminal says so. This terminal description initializes the terminal to keep its arrow keys in local mode. This is a user option. This terminal description causes text output for normal video to appear as reverse, and text output for reverse video to come out as normal. Often this description differs from the usual one by interchanging the two strings which turn reverse video on and off.
Some terminals have a special line that is used only as a status line.
On other terminals, enabling a status line means removing one screen line from ordinary use and reducing the effective screen height. Inheriting from Related Descriptions When two terminal descriptions are similar, their identical parts do not need to be given twice. We say that one description refers to the other, or inherits from the other. Users and application programmers do not need to be concerned with it. Since the reference terminal description is used last, capabilities specified in the referring description override any specifications of the same capabilities in the reference description.