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Where in memory do I the IDT?

Anywhere you like.  You need to use the lidt instruction to set the location and size.

Ok I will rephrase the question. Where in memory is the best place to put the IDT?

Wherever is most convenient.

No, seriously. My OS puts the IDT wherever the heck the allocation pointer is when it comes time to create it.

In my os, it is an array declared in the standard fashion which I initialize at runtime.  Then I use a pointer to that to set the IDTR.

Oh ok. Thanks alot guys.