With or without humans

Clients may or may not present info to humans Browsers were all about presenting pages to people. XML makes it more plausible to use the Web to send information to people's computers, which then use that information without necessarily presenting a 'page'.
Clients may present some info to humans, process the rest automatically (rules creation - transformation and routing)
Protocols approach reuses HTTP XML-RPC, SOAP, and their ilk are already using HTTP to send information between computers, without concern about human readers who may or may not be interacting with their information.
Can browsers and human-oriented clients reuse protocols? Protocols can be used to build information services, whose contents are then used by other processes to generate human-readable content.