what is far pointer?where will you use far pointer?

what is far pointer?when will you use far pointer?

Sometimes you can get away with using a small memory model in
most of a given program. There might be just a few things that don’t fit
in your small data and code segments. When that happens, you can
use explicit far pointers and function declarations to get at the rest of
memory. A far function can be outside the 64KB segment most
functions are shoehorned into for a small-code model. (Often, libraries
are declared explicitly far, so they’ll work no matter what code model
the program uses.) A far pointer can refer to information outside the
64KB data segment. Typically, such pointers are used with farmalloc()
and such, to manage a heap separate from where all the rest of the
data lives. If you use a small-data, large-code model, you should
explicitly make your function pointers far.

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