You apparently haven't dealt with large networks. Ever since the late 1990's microsoft included tools to allow remote access to computers for the purpose of remote troubleshooting, software or parameter updates, and monitoring of remote computers.
Things like remote desktop required confirmation to allow the connection. This was since obsolesced by enterprise software tools.
But when it came to voting machines, the connection devices to the internet was kept powered off, except when Dominion or other administrative overseer, requested they turn the access on.
The other time it was turned on, was to upload election day tabulations to the secretary of states (or election boards) systems.