Remotely CALLed programs cause the AcuConnect server to start a new runtime on the server machine. AcuConnect and the runtimes it spawns do not have to be the same version as the client. Although users can spawn multiple AcuConnect runtimes on the server, spawned runtimes cannot themselves start runtimes on other server machines. They can, however, call other programs on the same server.
AcuConnect can spawn Acu4GL or AcuServer linked runtimes even if the client runtime is not so linked.