I didn't quite understand most of your questions, so I'm just going to outline how iCam works.
A computer runs icamsource, which monitors one or more cameras and, if enabled, detects motion and/or records images of those motion events. Icamsource uses the time from the computer's settings to determine the time when the pictures are taken. A username and password is entered in icamsource, and when that same username/password combination is entered in the iCam app on your phone, you are then able to view all of the cameras being monitored by icamsource. Also, you will be able to view any recorded motion events from your phone. If you used a unique (and secure) username/password combination in icamsource (on the computer), then you will be the only person able to see the camera feeds (assuming your computer is set up securely...firewall, etc) and recorded motion events. Also, anyone who has access to your computer would also potentially be able to view your camera feeds and motion events.