The advantage that infopath has is that it has the ability to use digital ink (handwriting) out of the box. if your version of Windows includes Microsoft Ink (tablet XP, Vista, Win 7), then Infopath will allow you to record text and images using various input devices (mouse, pen, etc.) depending on the control you are using. The text box will use handwriting recognition to convert text to text, where a free drawing will be allowed as an image window, perfect for caputring signatures.
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