ssh
ssh can be used through terminal to access the robot remotely. This requires knowing the IP or using a service like NO-IP.
TeamViewer
TeamViewer is a remote desktop application that does not require knowing the IP as long as it is running on the robot. TeamViewer generates an ID on the basis of various hardware and software identifiers from the computer itself. Every TeamViewer ID is unique and attached to a specific device. Think of it as a telephone number: it helps TeamViewers servers to identify the device and direct remote control connections to the correct PC.