short pointers (32 bit) in 64 bit apps

[Reza Roboubi <reza@xxxxxxxxxx>]

Is there support for "short" pointers in 64 bit applications?  As struct 
members, these short pointers would save space, but when accessed, they 
would automatically be treated as 64 bit pointers into the "current" 4GB 
space (namely where the containing struct resides.)

Thanks a lot.

Reza.