Are there any screen-sharing VNC-like things that allow jumping via links from one server to another (the way that HTML links allow jumping from one document to another)?
I'm sure it'd be a security/usability nightmare, but wonder if it might be an interesting nightmare.
Given that dereferencing a URI can result in program execution rather than simple transmission of a document (or, if you prefer, you can ssh to a host and then ssh thither) I’d say yes.
A host is a pretty lightweight concept these days (so lightweight and often ephemeral that we don’t use the term much and rarely even give them names). CL/DM was written in the mainframe era.
Yeah, as for program execution, I was specifically thinking of VNC servers that are the equivalent of CGI in that they produce "displays" that never occurred in any framebuffer. Hyperlinks would allow networks of this kind of virtual VNC...
I'm sure it'd be a security/usability nightmare, but wonder if it might be an interesting nightmare.