It doesn't really matter if "A = Inp(&h3da)" can do the same thing as Screensync because it is Screensync that should be used. I also did some tests with Sleep instead and it doesn't work so bad in other simpler programs. So it is because of my program that Sleep works less well there....

Sorry to come back to this, but I will send you something simple in a few days.

I just wanted to share with you all what I had discovered and not to help me debug my program if that is the case. I thought it would be interesting for you to know the effect of this INP.

I understand, but my program that I have modified over the years and over several years has almost 10,000 lines. I'm afraid it's because of a lot of other things that it works because now I doubt myself since your comments. So, I think it would be better if you tried it your way and as simple as pos...

It would be interesting if someone would try it on their side, just to see if it's only illusory on my side.

Maybe I am very lucky because it works by Hazard only with my program. Beginner's luck.

Sorry to contradict you, but I would have liked to replace it by a simple Sleep, which in fact does not work. The execution time of INP(&h3DA), which can reach 17 ms, is the same as Screensync and has the same effect, not Sleep which I had tried before with an equivalent time and with different ...

Then I assume that all is run as administrator, which is why it works.

Administrator is indicated to my account, probably by default during the installation of Windows.

I replaced Screensync with only "A = Inp(&h3da)", nothing else, I don't even use "A" and the effect is like Screensync.

I can only say that it works, although it seems better not to use it. I'll see what others will say about what you just mentioned.

Ok, so it's better to use Screensync.

Sorry for my ignorance, but why doesn't a runtime-error occur when using "A = Inp(&h3da)" ?

Why not use "A = Inp(&h3da)" instead of Screensync if it works despite the reaction of Windows ?

Is this the &h3da address you are talking about ?