Not proprietary. See open architecture
, open system
and open source
. Contrast with closed architecture
and closed system
To "run" a program (application). Open means "load the program and run it" or "launch the program and run it."
To engage a digital file. From the user's point of view, open also means to read the first block of data. From the programmer's standpoint, open is the first step, and "read the first block of data" is the next. Contrast with close
To open a switch means to stop or halt the current from passing through. The switch is then considered "off." See switch