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Revision as of 01:59, 30 October 2013

Welcome to the explain xkcd wiki!
We have an explanation for all 1479 xkcd comics, and only 0 (0%) are incomplete. Help us finish them!

Latest comic

Go to this comic explanation

Troubleshooting
"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.
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.

Explanation

Ambox notice.png This explanation may be incomplete or incorrect: The explanation of the title text is missing.

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 definitively so he never has to rely on this trick anymore.

One particular example of an illogical fix to a software problem is depicted in the comic. Here, Cueball is trying to help Hairy resolve the problem of lack of response from the software application to any mouse clicks. 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 ("off-screen") 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 and then switch the resolution back to normal. Switching the resolution in itself does not fix the problem (as often the highest resolution is being used so one can rarely switch to higher resolution to gain access to the modal dialog stuck in "off-screen" 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 these coordinates so that the windows do not end up in off-screen area after the resolution change. The latter is also a logical and prudent action 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.

By saying "Why is it even possible?", Hairy is quite correct in pointing out that the best way to address this problem at its root would be for the operating system developers to implement a mechanism that prevents the creation of modal dialog windows in off-screen area to begin with. Such mechanism could perform the coordinate adjustment of such windows during the time of their creation, thus making sure that the modal dialog window would always be accessible and visible.

In general, one can sort the possible solutions to the problem being discussed in the following order of preference, from best to worst:

  • (Best): Have OS programmers implement automatic coordinate adjustment during window creation
  • Have OS programmers provide easily accessible and visible control to invoke coordinate adjustment for all windows
  • Have OS programmers provide a shortcut to invoke coordinate adjustment for all windows
  • (Worst, depicted in comic): Have users rely on side-effect of properly implemented screen resolution change mechanism to fix the problem counter-intuitively.

Transcript

[Hairy sitting at a desk with laptop, with Cueball standing behind him.]
Hairy: Wait, why can't I click anywhere?
Cueball: I don't... Ugh, It opened a dialog box offscreen.
Hairy: Why is that even possible?
Cueball: It really shouldn't be. But you can fix it by changing your screen resolution to trigger a window cleanup.
Hairy: Seriously?
Cueball: I know, I know...



Is this out of date? Clicking here will fix that.

New here?

Last 7 days (Top 10)

Lots of people contribute to make this wiki a success. Many of the recent contributors, listed above, have just joined. You can do it too! Create your account here.

You can read a brief introduction about this wiki at explain xkcd. Feel free to sign up for an account and contribute to the wiki! We need explanations for comics, characters, themes, memes and everything in between. If it is referenced in an xkcd web comic, it should be here.

  • List of all comics contains a table of most recent xkcd comics and links to the rest, and the corresponding explanations. There are incomplete explanations listed here. Feel free to help out by expanding them!
  • If you see that a new comic hasn't been explained yet, you can create it: Here's how.
  • We sell advertising space to pay for our server costs. To learn more, go here.

Rules

Don't be a jerk. There are a lot of comics that don't have set in stone explanations; feel free to put multiple interpretations in the wiki page for each comic.

If you want to talk about a specific comic, use its discussion page.

Please only submit material directly related to —and helping everyone better understand— xkcd... and of course only submit material that can legally be posted (and freely edited). Off-topic or other inappropriate content is subject to removal or modification at admin discretion, and users who repeatedly post such content will be blocked.

If you need assistance from an admin, post a message to the Admin requests board.

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