why LIDT needed in Real Mode?

From: "Wendy E. McCaughrin" <spamtrap@xxxxxxxxxx>
Date: Fri, 30 Dec 2005 07:54:54 +0000 (UTC)

I note in much working Pmode code that a necessary part of the transition
back to Real Mode is: LIDT [RM_IDT], where `RM_IDT' is a descriptor for an
IDT with limit = 64K and base-address = 0, coinciding with the Real-Mode
IVT. Why is this necessary, since Real Mode does not use the IDTR? Or does
it?

.

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