Modern key-logging software captures the area under the mouse on each mouse click. The defeats those on-screen keyboards, and web-sites which force you to do the same. This of course requires software to be running on your hosts. There's existing technology which can reconstruct an image from a CRT using EFI, but LCD screens are a lot harder to pick up.

The newer Air New Zealand planes have USB power in each seat. It's not enough to power a laptop, but it's enough for most other gadgets.

all code must be written in ADA.

Unless you consider the cost of your electricity. That old PC will probably suck down way more power over a year than any of the SoHo NAS boxes.