It allows you to scroll down pages such as internet pages, and those in word and execl, just as if you did it using the side bar.
yes
Start the flight simulator by pressing CTRL + Alt + A or selecting 'Enter Flight Simulator' from the Tools menu. To take off and increase speed, press the Page Up key to increase thrust and move the aircraft down the runway. Likewise pressing Page Down key decreases thrust.
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No your press the right arrow key or you can buy a PowerPoint remote so you don't have to be next to your computer
if you mean in web pages, you might be accidentally pressing the SPace key while not writing something, this causes the Webpage to go down. Or you might be pressing the "page up" or "page down" buttons above the arrows keys
Usually you do it by pressing the Enter key. However, it can also be done by pressing the Tab key or the arrow keys or any of Home, End, Page Up and Page Down. You can also click on the little tick that appears beside the formula bar as you type in. So there are lots of ways, other than using the Enter key.
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Once into the web page you need press and hold down the "CTRL" key whilst pressing the "+" key on your keyboard. This will magnify the text on web pages. "CTRL" and the "-" key shrinks them again.
You can use the key command CTRL+ENTER to start a new page in the same document in Microsoft Word. You must press control and enter at the same time. Hold down the control key and then press enter. If you want to start a whole new document (and thus a new page), go to File in the menu and choose New.
The Mac's shift key is activated by pressing it down.
When you have scrolled half way down a page of text, pressing the Home key will return you to the top of the text. Pressing End will take you to the bottom of the text. Both the Home and End keys help you to jump between the start and finish of documents and webpages, etc.
If there is no actual Page Up key (as on a full size keyboard) it can be replicated by pressing the Function (Fn) key and the up arrow key.