Abstract: The Editorial program is one of the basic software package in a computer system The paper deals with the main idea and structure of the screen oriented (visual) display editor, for convenience called Y-edit, developed at software Development Center, Peking University of Iron and Steel Tech.
Y-edit written in C language is highly portable, running under unix operating system.It works at all kinds of visual terminals,by utilizing virtual terminal.The grammer between the control commands and corresponding control keys is defined, providing the user with the facility to define his own control commands and the corresponding control keys.
The responsive speed is elevated by the use of Gap working-area structure and simplified input control command.The success of Y-edit has provided ample experience in designing a system pratical program.