Is it possible to control or limit external access through window service manager
Start -> My computer -> right click -> manage -> Services and applications -> Services
and starting or stopping some services like remote access, i don't know much about it. which all service we need to establish a remote connection, remote access etc...
or block user through
Start -> My computer -> right click -> manage -> local user & groups -> users (Enable and disable some users should help me to disable external access?????????)