Can I hide BOINC from view?

Q: Is it possible to completely remove BOINC icon from system tray to prevent others to mess with it, and let the BOINC do its work in background, totally invisible?

A: Yes. You can install BOINC as a service and not allow Boinc Manager to load on Wndows start up. This way BOINC always runs, even when no one is logged in on the computer.

Use the third option.