Comment by tsimionescu

There is a clear physical reality to the door opening, the steel and glass being displaced. The computer does that triggered by certain conditions, that you can determine by experiment. There is no goal being assigned here - I'm merely stating that the system goes through a certain series of states that depend on both the raw hardware, and the programmed instructions, probably so.

Lets put it another way. Say you are some alien being trying to study the inner workings of a system like this with no prior knowledge of how it arose in nature. You will apply the principles of empiricism and try to determine the workings of this physical system through repeated experiments, measurements of the electrical and chemical characteristics of various parts, etc. If your experimentation is sophisticated and complete enough, it will necessarily have to include a representation of the software running in this processor, and of the algorithms it encodes - the behavior of the system cannot be explained without that. An outwardly similar system, built with the exact same "parts" (in the traditional sense, i.e. the same model of processor, motor etc), but programmed with different software, will behave entirely differently. This clearly proves that the software is a physical object that is part of the system and is necessary to fully account for its behavior.