XEDIT is a visual editor for VM/CMS using block mode IBM 3270 terminals. It is much more line-oriented than modern PC and Unix editors. For example, it supports automatic line numbers, and many of the commands operate on blocks of lines. One of the features is a command line which allows the user to type arbitrary editor commands. Because IBM 3270 terminals do not transmit data to the computer until certain special keys are pressed (such as enter and function keys) XEDIT is less interactive than many PC and Unix editors. For example, continuous spell-checking as the user types is impossible.

Read more about XEDIT:  Typical Screen Layout, Macro Language, History, PC and Unix Adaptations