Wow that is scary stuff. I was on one desktop and did that for my other one.
\\(pc name)\c$ and was able to see everything.
I live in a small apartment complex and attend a small college with everyone else so I mostly trust them but man if you lived in a big apartment/condo building. You could be attacked by people from all around above you beside you below you etc....
Now to access my workgroup. If a person manages to get access to my router would it show them the available workgroups or would he or she have to guess the workgroup name and safe it as his own designated workgroup??
Also. With the reg edit, will that disable any type of file sharing and only allow that admin account and no one else on that pc or even on network to access it?