non-transparent pci bridge

[buenos]

normally there are non-transparent pci bridges in multi-host systems, like compact-pci... In compact pci, one board is the system host, other processor boards can be only intelligent subsystems. and there are peripheral boards too on the bus.
the non-host cpu cards use non-transparent pci bridge to connect to the backplane cpci bus. the host cpu card uses a transparent pci bridge, the peripherals normally dont need any (they are transparent target boards).

CPU_card(host)   CPU_card    CPU_card   peripheral_card
   I                I           I                 I
-----------------------------------------------------------compact-pci bus

is it possible to read and write the memory of a peripheral on the bus, from an intelligent sibsystem cpu card, without the host handling the communication?
so, can a not-host cpu card access directly to a peripheral or to another cpu board directly?