to Wscheffer's post - Beyond explaining some technicalities which soon become obvious on their own anyway, like the fact that double-clicking isn't used, WIS's own help section doesn't offer much help, IMO, for the task of finding information for a specific subject matter. For example, a common problem is a CEL accompanied by code P0400, let's say on a 96 E320. If you didn't know where to look, beyond say a group number, how would you determine where to look to find the logic chain for that CEL/code? One just has to keep reading until he stumbles over it. Not particularly efficient, if you find it at all. But everyone tells me that WIS just takes time to learn (where to look for different topics). Thought there might be a more systematic approach to becoming a 'librarian' of WIS.