These are all automated messages. Means someone somewhere hits the button.
To be honest I'm not sure why some people receive a message from UKBA and others do not. It could be some box that the applicant ticks or it could just be if the ECO or caseworker actually presses the 'message button'. Not everyone receives any message from UKBA.
VFS messages never contain any indication of the result simply because they simply don't know. UKBA never tell anyone other than the applicant of the result.