Do I need to leave my computer on all the time with HCA running? Can I also use the computer for other tasks?

Well it depends. Once you create your automation solution you can either leave HCA running on your computer or you can use HCA to program all or pieces of it into available stand-alone processors. HCA can download into the SmartHome HouseLinc, Elk Products Magic Module, the CM11 and program scenes into PCS and SwitchLinc switches. If you automation solution is complex or you are using features beyond the capability of those downloadable processors, then yes, your computer must remain on. HCA consumes very little of the computer's resources and you can do other tasks with your computer while HCA is running.