Or WiFi, or radio, but his idea was to make products without built in wireless work without wires, but also without adding external adapters. The thing was written badly anyway, he went from a specific question about his printer to then telling others they were asking too many questions to find out what printer he had because he just wanted to know how to make anything wireless. Ask a question, get an answer, then complain that people asked for details or answered what was asked when there are other secret questions.
The point was not the actual question but an example of the type of stuff that would make me put someone on the ignore list.
Its REALLY hard to i'd sneaky's unless they're hi-end and easy to spot. A lot of them started life as a pos bar-cue. BTW, for the $$ Schmelke's are tuff-to-beat.