Multi-Device AS Configuration with cyclone IV GX and cyclone III? +remote upgrade?

Hi,

I have a system using 2 different FPGA: 1 cyclone IV GX (master) and 1 cyclone III (slave). The cyclone IV uses AS configuration to boot from epcs and then programs the cyclone III in PS mode.

I would like to upgrade this system.

Is it possible to use a multi-Device AS Configuration with 2 different .sof with 2 different FPGA?

I also need to use the remote upgrade function. Is it compatible with multi-sof configuration?

I don't understand well how the FPGA manages multiple sof (epcs address, sof selection...), is there some examples?

I would like to use something like that:

-----EPCS-----

@0

.sof cycIV factory

.sof cycIII factory

@X

.sof cycIV user

.sof cycIII user

With remote upgrade function manage by cyclone IV.

Thanks in advance.