At the moment I have 3 windows open, though that is on two screens... However, it would be quite possible to have all three on one screen along with a dozen or even quite a bit more... The number of windows you can open depends more on your computer capability than anything else... If you are running an advanced computer with a lot of RAM and in 64 bit mode, it is likely that you could open way more windows than you would ever want at one time...
In addition to having 3 windows, I also have 3 tabs open in my browser... A few minutes ago, I had more like 10 tabs open, but I got done with them and closed them... I use Firefox as a browser, but Internet Explorer also can use tabs now... Tabs are easier to use because they tend to be less cluttered... If I open 30 tabs in my browser, it will just move some off the screen to the right and I can either work my way to them, closing others as I go or I can scroll to them... If I had them open as windows, they would be tightly packed on my task bar and it would be hard to know what was open... As it is, I can open as many tabs as I want in my browser and still keep only 3 programs in the Task Bar...
The Task Bar is the bar, usually at the bottom of the screen, that has your Windows Start button and other icons indicating running programs and open windows... If I want to check my mail program, I only need to click on the program listing on the Task Bar to see it... My tabs are listed near the top of my browser window, but that can be different based on how you set it up... In Firefox, there are dozens of tools available to change how you see tabs -- I tend to just mostly use the defaults...
If you are talking about viewing 2 windows at the same time, that would depend on whether you have room to fit both of them on the screen at the same time... For example, if you want to watch a U-tube video while doing a Google search on the person posting the video, you can re-size each window so that they run next to each other (or in any other configuration you would like)... However, if you are using a netbook with a 9 inch screen, they will be pretty small... I am on a 22 inch wide-screen, so it would be easy for me to do that...
To re-size each window, put your cursor in the upper left hand corner of the window so that the cursor becomes a arrow pointing in two directions, to the diagonal... Click and hold your mouse as you drag the windows down at a diagonal to make the window whatever size you want... Once it is the correct size, release the button and put the cursor on the top of the window at a spot where there is no text and click/hold the mouse button again to move the smaller windows wherever you want it on the screen... Do the same with the second window to get them side by side or however you want them... You can do this with as many windows as you can fit on your screen, though they become less useful the more you get...
You can select any window by clicking on it or by clicking on the reference for it on the Task Bar... Keep in mind that the one you click on will be active and you won't be able to do anything with one that isn't active... For example, I can type in this window, but if I check my mail click on my mail window to check it, any typing I do will not go in this window until I click on this one again... On the other hand, if I am running a video in this one, it will still run even though I go to another window, so I could be searching Google while watching a video if they are both visible on the screen...
Hopefully this answers your question...




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