Regarding all development that resides in Game Maker: Studio, up to version 1.4. GML and Drag & Drop, deployment & build targets. Does not include Game Maker: Studio 2.0, and does not include older versions of Game Maker.
Information about Game Maker: Studio 1.x
by YoYoGames.
Use this tag when doing anything in Game Maker Studio 1.2, 1.3 and 1.4.
This includes information on different platforms, export modules, GML, the Drag-and-drop interface and IDE usage.
Game Maker: Studio 2.x will have a separate tag, as it's not identical and not completely backwards-compatible with GM:S 1.x.