What are the Courier and Postfix "Screens" ?

[spflanze]

Step 3 of the installation instructions at:
http://isp-control.net/documentation/dok...ion:debian
says there will be a "courier screen" and a "postfix screen." I would need to install ispCP remotely using a SSH command line console. Is this "screen" a window in Debian's desktop shown by the server computer's video monitor? If so that screen will be thousands of miles away in a data center. I do not have access to it and so would not be able to enter the answers to the questions these screens ask.

I am asking because I want to make very sure I will not get hung up in a procedure that would require physical access to the server to complete.