Previously, I was working with PIC16 and PIC18 series, and none of them provided multiple channels for programming. Now, I am designing my first PIC32 circuit, and I'm very confused with these multiple programming/debugging channels.
Why are there more than one of them? As far as I know, programming is a special event, and it is done when doing firmware update, or during development stage, or just after manufacturing process. Neither of these cases require more than one programming channels. Why do they provide 3 or 4 channels for this? I want to leave ICSP pins in my circuit for programming; can I choose either of these channels, or must I prefer a certain one?