A method for verifying the connectivity of software applications hosted on networked computers. The connectivity of hosted function applications to be loaded into networked computers is verified and validated using quasi-hosted function applications that simulate the communications functions (i.e., connectivity) of those hosted function applications. The quasi-hosted function applications are run on the same hardware that the real hosted function applications will be run on. Furthermore, the connectivity of a real hosted function application loaded into one computer can be verified and validated by simulating communications of that real hosted function application with a multiplicity of quasi-hosted function applications running on the networked computers.