These guidelines may cause some command prompts to be longer than they were previously; some prompts may occupy two lines.
Exceptions may have to be made for command prompts if adherence to the guidelines results in an awkwardly phrased prompt.
Script compatibility with previous versions of AutoCAD should be maintained. If option lists are shortened, the previously valid options should continue to be valid, even if they are not displayed. Option keywords and accelerators for existing options should not be changed. New options may be added, but all existing options should continue to exist and use the same shortcuts. Command syntax remains the same.