Path stitching is a quick way to change from one layer to another when running wires. When creating a path (hit p or choose the "Create->Path..." menu entry) with any metal or poly layer, the user can automatically change to any other wiring layer physically adjacent to the current layer. For example, when running a metal 2 path in a three-metal process, the user can change to either metal 1 or metal 3, and Virtuoso will automatically place the correct contact type and change the wiring layer. (This is almost identical to Magic's "path tool.") The CDK includes the required symbolic contact definitions, which are located in the technology libraries.
--Slipa 11:51, 27 February 2006 (EST)