To co-sign a document means that a responsible person need to sign a document in addition to the user. It is double signing used for important documents or to confirm that a user has participated to a course or e.g. has got a certificate.
If you have to co-sign a document you will find this on the To Do Panel or My documents. (Update Link!)
- Select the document and user
- Click on the V for co-signing
- Or click on the X for rejecting
When you co-sign you can add a comment to the user you are co-signing for.
The comment is visible for the user, and can be found in "My documents".