Re: Webmin is a web-based interface
Sorry, that approach is riddled with assumptions and security problems.
The only secure way is long poles scavenged from the local snooker hall with a glove stuffed with plaster of paris on the end. Using this device with a bit of practice you can remotely control even an air-gapped computer from 2 cubes away.
Any attempt to man-in-the-middle using a tenon saw is easily detected, and counter-measures can be deployed, eg a bent paperclip launched with malice aforethought and a fat rubber band.