Co-Signatures have been implemented for sites that need the ability to have a supervisor signature for providers such as residents.
You need at least 2 providers in SOAPware and one of them must NOT be marked as a supervisor. To require a supervisor signature, go to Menubar > Tools > Provider Manager and uncheck the box at the bottom of the Provider Manager dialog. It is the box in front of Is Supervisor.

When a provider who needs a supervising signature signs into SOAPware, a dialog window will appear that asks the user to select a supervisor.

The provider needing a supervisor signature will sign off a document. Then a Task will be created for the supervising provider in SOAPware.
The supervising provider will review and then sign the document.