1.1.3 Program example helper window You can go to [ View] to open the [Program example helper window]. This window lists all the Lua functions, including Basic syntax, Internal memory -$ (for reading and writing), Static memory- $M (internal register for non-volatile reading and writing), External link (reading / writing address for controller), File read / write / export / list, Math, Screen (for screen operation), String, System library, Serial port communication, Text encoding, and Utility. 11