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Question: lot of .exe folders are created on my windows7

Answer: try that...

The question was closed at 11:57:57 (according to the hover-over-"x-mins-ago" bar) and the answer was posted at 12:16:35. It's a fairly lengthy answer, so it's possible that it was started to be written before it was closed but I swear I've started to answer a question then I got a banner along the top saying "this question has been closed" and the answer was no longer post-able.

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Also keep in mind that the website is actually several servers acting as front-end which have individual clocks that can be off by seconds due to lack of strict time-keeping. You can post something with a given timestamp that actually represents a time in the future or the past by several seconds. This is why you can find answers posted to questions where the answer timestamp occurs before the question timestamp. –  Adam Davis Sep 25 '13 at 14:57
    
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1 Answer

up vote 65 down vote accepted

If a question is closed while you're answering on the full version of the site, you will receive a notification that the question was closed and the 'Post Your Answer' button will be disabled. However, this is only a client-side restriction, so it is possible in some cases that this process fails.

When it does, the backend allows for a grace period of around four hours (previously there was no time limit). Presumably the client-side restriction did fail in this case, and since the answer was "in-flight", as Jeff describes it, the server accepted it despite the question already having been closed.

For users answering from a mobile device, there's no client-side restriction in place to begin with, so this situation is presumably even easier to create when using the mobile version of the site.

As a side note, this apparently even works for questions closed due to migration.

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For an example, see here: meta.stackexchange.com/q/91932/2598 (It just happened to me) –  jjnguy May 19 '11 at 15:13
    
Thanks for clarifying this. –  tombull89 May 19 '11 at 17:42
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