Well, I see too many "possible" problems of technical and political nature. Perhaps I was too hopeful and/or Voltaire is still as right as ever, but I was hoping for "yeah, sure!", "here is a link showing how to do it ..." kinds of answers.
Here is plan B: * I may have to use an extra laptop (perhaps with Debian installed, or, preferably) * still with an external DVD (I would like to be sure on a physical level that my baseline hasn't been messed with and I don't want to waste too much time checking it) * connect that extra laptop to their laptop to gain internet access via a direct cable connection or: * use a relatively large USB with a special init configuration to use a RAM disk and/or an extra disk and discard -absolutely- everything that may have been installed or dropped in my files and folders while I was connected to the Internet is there a Debian derivative conceived around such basic ideas? lbrtchx