[1] The most common approach to this service is remote control of a computer by using another device which needs internet or any other network connection.
Here are the connection steps: Many computer manufacturers and large businesses' help desks use this service widely for technical troubleshooting of their customers' problems.
Therefore you can find various professional first-party, third-party, open source, and freeware remote desktop applications.
PPP is a set of industry standard framing and authentication protocols that enable remote access.
The term was originally coined by Microsoft when referring to their built-in Windows NT remote access tools.