Claris CAD has a double line tool. It is also called the wall tool. It is very popular with architects for drawing walls and other objects that require close, side-by-side lines.
This information was provided by Claris Corporation on 16 March 1998, and incorporated into Apple Computer's Tech Info Library.
Allows the drawing of two parallel lines simultaneously.
The user can also draw a second line with the offset modified and the second line will be parallel at a user defined distance.