The Keyboard Character Keys Character keys include keys for letters, numbers, and punctuation, as well as the Space bar. If the user presses one of these keys while entering text, the corresponding character is added to the text. Although the result of pressing one of these keys depends on the application and the context, it is essential that your application use them consistently, as described in the following paragraphs. The Enter key tells the application that the user is through entering information in a particular area of the document, such as a field in an array or table.
Most applications add information to a document as soon as the user types or draws it.
However, the application may need to wait until a whole collection of information is available before processing it. In this case, the user presses the Enter key to signal that the information is complete. While the user is entering text into a text document, pressing Enter has no effect. Tab In text-oriented applications, the Tab key is used to move the insertion point to the next tab stop. Pressing Tab often causes data to be entered before moving to the next item.