How works display identification in Windows 7

Samuel, welcome to seven forums. The graphics card determines the monitor number. Here is a pic of mine . It will start at the top left then go right and then the bottom row. Because I have my Dell on the display port it is number 1, then the HP is number 2.

win7confusions said:

Hi,

does anybody know how the display identification works in Windows 7. How does Windows(or the graphic adapter) decide which screen is number 2 and which is number 1?

Background: We develop a software that runs on systems whith 2 monitors. Usually 1 monitor is for the customer and another monitor is for the advisor. We can configure our application so that the customer application runs on display 1 and the advisor application on display 2 or the other way round.

So how do i figure out which monitor becomes screen1 and which one screen2 after installation of windows?

best wishes
Samuel

Hi Samuel,

Welcome to Seven forums.

I would also concur with Dude it is graphic card function to decide which display to set as primary. I use my laptop with a TV or Monitor and internal LCD would always be set as number 1 and then anything else.

Not quite sure about Desktops, I believe first connected Monitor would be considered as number 1 and any other monitors connected would be number accordingly.

However, you should be able to configure whether which Monitor would be primary and what display you would require on the same monitor.

Hope it helps.

win7confusions said:

Hi,

thank you for your replies. Right now I'm quite sure that it is the driver of the graphic card that determines the monitor number. I was a little bit confused - because when we installed the system with Windows XP the monitor numbers where different than with Windows 7(even with the same hardware). So if Windows does not any magic with the monitor numbers - and I think it doesnt - it should be the graphic driver.

best regards

Hi win7confusions,

Thanks for posting this reply. I understand graphic driver decides which one would be a primary monitor and which one would be secondary.

I am sure this information might be useful for other users as well. If you have any further queries, please feel free to contact us.