In the mid-1990s, the Resource Reservation Protocol was touted as the IP co
unterpoint to ATM's QoS superiority. The lack of RSVP-enabled applications
and of scalable network machinery, however, eventually made it appear to be
an "emperor with no clothes." But RSVP is making a quiet comeback thanks t
o developments like Winsock2, which gives application developers a standard
API for invoking RSVP reservation setup requests.