What is the difference between Fastboot and HBoot mode?

and why can't I see an option to boot into recovery mode on my HTC Hero (Orange UK)? Is it already in recovery mode when I can see the Fastboot/HBoot menu? Initial menu after holding vol-down when booting: Initial menu after holding vol-down when booting (click image to enlarge) If I press back, I get the following screen: (Click image to enlarge)