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I've got an idea! I will add this thread as a solution to that question... 
I'm not questioning your powers of observation; I'm merely remarking upon the paradox of asking a masked man who he is. (V)
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As an alternative, he may destroy the system at user logout.
Veni, vidi, vici.
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Who logs out? 
Those who fail to learn history are doomed to repeat it. --- George Santayana (December 16, 1863 – September 26, 1952)
Those who fail to clear history are doomed to explain it. --- OriginalGriff (February 24, 1959 – ∞)
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The first one who logs out. That's called 'The Waterfall Logout'.
Veni, vidi, vici.
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Hay! That's brilliant! We add that suggestion to the answer: "When any user logs out, log 'em all off"
Are you bucking for promotion from Minion to Henchman this year? Because I see big things in your future with this Evil Overlord Operation...
Those who fail to learn history are doomed to repeat it. --- George Santayana (December 16, 1863 – September 26, 1952)
Those who fail to clear history are doomed to explain it. --- OriginalGriff (February 24, 1959 – ∞)
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OriginalGriff wrote: There's a QA question, wanting to know how he prevents his users from logging in more than once a day.
The first question is why do you care if someone logs in more that once a day? 
The report of my death was an exaggeration - Mark Twain
Simply Elegant Designs JimmyRopes Designs
I'm on-line therefore I am.
JimmyRopes
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That's what I was wondering.
Along with Antimatter and Dark Matter they've discovered the existence of Doesn't Matter which appears to have no effect on the universe whatsoever!
Rich Tennant 5th Wave
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Misunderstood requirements:
Requirement : "User shouldn't be able to do X more than once a day" (e.g. backup)
How it is understood: "I'll not let the user login more than once a day, where's the question of doing X more than a day?"
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Shameel wrote: Requirement : "User shouldn't be able to do X more than once a day" (e.g. backup)
Don't let the user do more than one backup per day regardless of how many times they log in. 
The report of my death was an exaggeration - Mark Twain
Simply Elegant Designs JimmyRopes Designs
I'm on-line therefore I am.
JimmyRopes
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You are overengineering the solution - Just keep the user logged in for 24 hours 
I will never again mention that Dalek Dave was the poster of the One Millionth Lounge Post, nor that it was complete drivel.
How to ask a question
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[Officer]: Sir, PLEASE STEP AWAY FROM THE KEYBOARD !
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I think the new million has gone into your head direct, time now to shed your arrogance.
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Thanks! Dave Auld got tired of waiting and upvoted a couple of my articles to push me over on Friday!
Those who fail to learn history are doomed to repeat it. --- George Santayana (December 16, 1863 – September 26, 1952)
Those who fail to clear history are doomed to explain it. --- OriginalGriff (February 24, 1959 – ∞)
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All that energy put in reaching the one-million mark for the sole sake of getting some easy up-voting on your articles. I think that you need a better strategy 
~RaGE();
I think words like 'destiny' are a way of trying to find order where none exists. - Christian Graus
Entropy isn't what it used to.
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Damn! Sussed...I must think again...
Those who fail to learn history are doomed to repeat it. --- George Santayana (December 16, 1863 – September 26, 1952)
Those who fail to clear history are doomed to explain it. --- OriginalGriff (February 24, 1959 – ∞)
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OriginalGriff wrote: But that'd be evil, right? Because anyone who can't work that one out for himself is probably gonna do it... 
Must...
...resist...
...keyboard...
Right. 
The report of my death was an exaggeration - Mark Twain
Simply Elegant Designs JimmyRopes Designs
I'm on-line therefore I am.
JimmyRopes
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Or make a log file with username and date and check if this user logged in with existing date in table prevent him from logging in else he is logging in for the first time then add the entry to the log table.
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Well, that's hardly evil, is it? A dumb way to do it, yes. But not actually evil.
Those who fail to learn history are doomed to repeat it. --- George Santayana (December 16, 1863 – September 26, 1952)
Those who fail to clear history are doomed to explain it. --- OriginalGriff (February 24, 1959 – ∞)
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Quote: "When a user logs in, change his password. Then email him the new one 24 hours later. But that'd be evil, right?"
Sure, it is evil. These solutions are quick and dirty. We can't really use them for production.
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You can if you are an Evil Overlord, or a Klingon. 
Those who fail to learn history are doomed to repeat it. --- George Santayana (December 16, 1863 – September 26, 1952)
Those who fail to clear history are doomed to explain it. --- OriginalGriff (February 24, 1959 – ∞)
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True. I never knew about these thing
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Time to learn.[^]
Those who fail to learn history are doomed to repeat it. --- George Santayana (December 16, 1863 – September 26, 1952)
Those who fail to clear history are doomed to explain it. --- OriginalGriff (February 24, 1959 – ∞)
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It's really amazing Griff. You made my day 
Thanks for sharing.
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