Authentisign and the Counter! They Offered what_wEdits
First 33 minutes, Response type counter using forms and Mark-Up tools to strike over and initial changes. One side of Transaction participating.
Second 33 minutes: Both sides of contract in One signing event. In sequence, with Participants able to Strike Over, Mark-up and Add initials to create In-Line counter offers. One signing, for both sides of the offer / lease.