> Apparently, the PICKit2 and ICD2 has some common features. 
Hardware wise the pickit2 and ICD2 are pretty different. The ICD2 is a 
dual processor design with one processor (A cypress chip in older 
models, a USB pic in newer models) dedicated to USB and another 
processor (one of the big PIC16 chips) doing the actual debugging of the 
target.

The pickit2 OTOH uses a single USB pic.

IIRC realice is FPGA based and it wouldn't suprise me if the ICD3 is as 
well.
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