The imPcRemote Instant User version is working similar as TeamViewer does. It generates a 9-digit ID. Then, this ID should be shared with you on the telephone while you start imPcRemote Instant Admin. Entering the given ID into the corresponding field the connection is made. So you can start working with the remote computer right away.
For more info about Instant apps you can find here.
Please read what others think of the product: Testimonials