joint currency intervention

What shape will a "joint currency intervention" take? Do G-7 buy Japanese bonds, or...? I don't really understand this stuff. Thanks.
 
Not sure of the details in this case but I think it looks like a call to dealers (Barclays, Goldman, BNP, Citi, ...) saying...
ECB: offer for 1 yard EURJPY... mine
BOC: offer for 500 CADJPY... mine
FED: offer for 2 yards USDJPY... mine
...
 
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