To use the on-screen keyboard in Windows 7, click Start, select Control Panel, click Ease of Access, click Ease of Access Center, and click the Start On-Screen Keyboard button. To enter key combinations, click the first key and then the second key.
The Options key of the on-screen keyboard in Windows 7 allows you to customize the keyboard with options that control click sound, way of typing, text prediction and scan through keys. The Text Prediction feature keeps track of your frequently used words and positions them at the top of the word list to speed up your typing. The Scan Through Keys feature lets you select an entire row of keys, which can be useful when using text prediction.