Depends what you mean by asynchronous. They are asynchronous, in that two high level programs using the mechanism to communicate can do so without reference to any other information or timing references, for instance when requested to do so by a user. No doubt at the lowest levels of CVI and/or Windows there are algorithms which mean that data flows will probably be synchronised to some clock tick or other, but it is irrelevant for all practical purposes. The nature of TCP/IP communication is inherently uncertain, from a network timing aspect.
Are you seeing some kind of timing issues?
JR
