Explain xkcd: It's 'cause you're dumb.
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Title text: "Oh, you're using their Chrome APP, not their Chrome EXTENSION. They're very similar but one handles window creation differently." is a thing I hope I can stop saying soon.
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The humor of this comic revolves around the fact that due to complexity and somewhat low quality of the modern software, the reasons for many problems that users experience (and possible solutions) are not obvious and straightforward and methods for repairing the problem often rely on invoking certain seemingly irrelevant actions that happen to cause a desired side-effect. As the author points out, knowing these non-obvious ways to repair the problems requires memorization of lots of "stupid computer knowledge" rather than relying on logic and understanding of general principles of software. By "stupid", of course, he means "seemingly irrelevant".
In many cases, Randall (or Cueball as his avatar) loves to help people using his specific knowledge (see 208: Regular Expressions). But when the trick is "stupid", he would prefer the programmers to fix the problem definitely so he never has to rely on this trick anymore.
One particular scenario that is used as an illustration of such illogical way to repair the problem with the software is depicted in the comic. Here, two users are attempting to resolve the problem of lack of response from the software application despite attempts to click on any elements of it. A suggestion is made that this is not due to abnormal behavior of the software ("freezing"), but rather because either the user or the software itself has opened a modal dialog window with coordinates outside of the main screen area, where it can not be seen. Modal dialog windows in desktop operating systems by design get the sole focus of the user input when launched, blocking access to the rest of the application window. They are valid GUI tools and are used when the software needs user's input before it can proceed further. However, opening such window and placing it outside of the visible screen area ("offscreen") will make the window both inaccessible and invisible to the user, precluding him/her from closing it and re-gaining access to the software. One non-obvious way to repair such problem is to switch the screen resolution outside of the program experiencing the problem (using operating system configuration tools) to some other resolution not normally used and then switch the resolution back to normal. Switching the resolution in itself does not fix the problem because most often the highest resolution is normally being used so one can rarely switch to higher resolution to gain access to the modal dialog stuck in "offsceen" area. Instead, the fix relies on the fact the in many desktop operating systems the resolution switch also forces the operating system to redraw all windows on the desktop (which in itself is a logical and normal action) and, while doing so, some operating systems will also reevaluate the appropriateness of the coordinates of all windows and adjust them so that they are do not end up in off-screen area after the resolution change. The latter is also a logical action and prudent by the operating system, however, in our scenario it is used as a side-effect to fix the problem. This is due to the fact that the operating systems rarely provide other, more obvious ways to bring the off-screen windows back to the visible area.
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