The on-screen keyboard in Windows is a scaled-down version of a full-featured on-screen keyboard called ScreenDoors 2000, manufactured by Madentec.

Madentec Website link for OSK Upgrade

ScreenDoors 2000 enhanced features include:

• Word Prediction (both "this word" and "next word" prediction)
• Abbreviation Expansion
• Resize-ability
• Customization
• SDK's to embed in other applications