1. A server computing device comprising: a processor; and one or more processor-executable instructions stored on a computer-readable storage medium of the server computing device, said processor-executable instructions including instructions that, when executed by the processor of the server computing device, implement: a runtime environment adapted to execute one or more model objects, said model objects corresponding to a process device within a continuous process, a scheduler process of the runtime environment, said scheduler process implementing one or more system events in accordance with a periodic schedule, an on-demand process of the runtime environment, said on-demand process implementing one or more aperiodic user events in response to receiving a request for the user events from a user device, and an event manager process of the runtime environment, wherein the event manager process synchronizes implementation of the system events and the user events, wherein the runtime environment executes the one or more model objects in response to the synchronized implementation of the system events and the user events.