On my computer I have 3 primary partitions:
1. "System reserve" which contains e.g.the Bootmamanger and MBR
2. First Win 7 installation ("main")
3. Second Win 7 installation ("reserve")
When I boot now at first the Bootmanager on the first primary partition is called/started which in...
boot
boot manager
boot menu
boot options
computer setup
disk management
drive visibility
explorer
hidden partition
mbr
multiple installations
partition
primary partition
renameentries
storage
system reserve
system settings
user interface
windows 7