Forms adding Signature automatically.

HI Folks,
Has anyone figured out a way to assign a signature to a form automatically?  My customer just want's the manger to hit submit on the form and there signature drops on the signature field/line.  I don't even know where the signature would be stored and how.  In an image file and then stamped?????
Just fishing to see if anyone has any tricks up their sleeves.
Thanks in advance for any advice.
 

Michael,
we created bitmap DocuWare stamps - each with an image of manager signature and have them applied automatically by an API program as required.

Thanks Josef,
Would you be willing to share your API with me?