BindUser Method
Binds a new UserID to the Key.
Syntax
int BindUser(const QString& qsUsername);
Remarks
Use this method to add a new Username as an owner of the Key.
Note that the key needs to contain its secret counterpart to be able to sign the new user ID.
Error Handling
This method returns a result code; 0 indicates success, while a non-zero error code indicates that this method encountered an error during its execution. If an error occurs, the GetLastError() method can be called to retrieve the associated error message. (Note: This method's result code can also be obtained by calling the GetLastErrorCode() method after it returns.)