The representation of the mouse on-screen. Depending on your settings, the cursor can be many different things.
This is what you see on your computer screen when you have no windows open. It may be a solid color, or it may be graphics. On the desktop, there will be icons, including one called "My Computer" and one called "The Recycle Bin."
This is a small window that is demanding your attention. You must respond before you can continue using the program that displayed the dialog box. A dialog box does not have a minimize or maximize button and does not show up on the taskbar. It is only a portion of its "parent" program. Most dialog boxes have a cancel button.
Using a modem to dial into a remote site network.
Move your mouse pointer over the object, then press the left mouse button twice in a row quickly. Be VERY careful to not move the mouse as you double-click. If you move the mouse while trying to double-click, you may end up dragging the object instead of double-clicking it.