The blinking vertical bar that appears in some applications. It is a form of the pointer. The cursor shows you where your text will be positioned when you type. Desktop Basically, the desktop is the computer screen. It is called a desktop because most of the things that users do at their computer were things that used to be done on a desktop.
Users can rearrange the items on the desktop in any way that they like.
A dialog box is a box that pops open on the front of your screen when you use certain commands. It will not disappear or let you do anything until you click on one of the buttons within the box. Here's a typical example from MS Word. Note the thick and thin lines of the border. Clicking the mouse button twice in succession.