The Central Instance panel during an Negotiation session looks like this:
1) Product Details & Prices
Lists the Details & Prices concerning the product currently loaded (the details available depend on the Project's settings).
You'll also find the related Media associated to the Product, such as Pictures and videos (3D Models not available during a Negotiation session)
As a Presenter account you have access to all the price.
2) Attendees connected
Each time an Attendee
connects to the Project, he will appear in the left panel, this panel
also gives a hint of the Attendees order state after
a product has been pushed. Indeed, once the Attendee validates its order, then
its name will turn green.
3) Attendees Orders
The central grid panel
recaps the last five products pushed by the Presenter and the orders associated for each Attendee.

Info:
A number greater than 1000 will be shortened using the "1K" abbreviation, to view the real value click on the number.

Note:
Only the orders of the Attendees which are connected can be viewed.
4) Attendees Total Orders and Nearest date
The
bottom part of the central grid recaps the total amount of orders taken
by the Attendees concerning the five last products pushed by the
Presenter. It also provides the information about the nearest date
picked among all the Attendees for each of the five last products
pushed.