Programming several devices on same SPI bus

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I have a board with two AVR's. I just wondering about the best method of programming them as they share the same SPI bus? (One is acting as slave to the other).

I want this to work well in a small volume production aa well and not just on my desk.

My favorites:
1. My oscilloscope, Yokogawa DLM2024.
2. My soldering iron, Weller WD2M, WMRP+WMRT.
3. JTAGICE3 debugger.