Thank you for your message.
If all I need is the Viewer on each of my four respective PCs, then I haven’t yet found how with Viewer one can generate a given PC’s Internet ID?
Actually, in the described scenario you need to install both modules on each computer - Viewer
for when you need to access a remote machine from this computer and a Host
installed on a remote machine. The Viewer is used to connect to Host/Agent, i.e. it's not possible to connect from Viewer to Viewer, you can connect from Viewer to Host or Agent
Here's also a Quick Start guide
that provides basic information about the program and helps to establish your first Internet-ID connection.
Hope that helps.