⚂ May contain awesome.
A comparison
This post explains how to replicate GameMaker: Studio's application_surface in older versions.
Doing so is more or less a requirement if you want a scaled window with pixel-perfect rendering and/or do not desire to modify your tilesets (although a tool had been made since to help with this).
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Above: in-game view. Below: taken screenshot of entire room
In some cases, a moment comes when you need to display specific content in a area smaller than itself, thus requiring scrolling.
GameMaker does not support 'clip rectangle' type of command for its reasons, however it is easy to 'clip' area to be drawn by using an 'buffer' surface to draw content in, before drawing that to screen.
Attached example illustrates sample implementation of such.
Most often, content of such would be text. And maybe an image. Or two.
Since images would require a bit more code, example does simple and efficient - long long text is rendered into a surface, which is later drawn into an other 'buffer' surface to display it as part of window on screen.
Also there is a scrollbar, which obviously can be improved, if it needs to serve purposes other than displaying position of 'window'.