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Huge datasets under Win2000

I have to read in over 13,000,000 observations [eventually over 
33,000,000] with the structure
dataShort = {dataShort, returnNum:0L, x:0D,y:0D,z:0D}

At first, either when reading in or processing, I ran out of memory with 
a message about IDL not being able to allocate memory to make the 
array.  So I read this into an Assoc variable which works fine.  Now , 
however, when I try to access parts of this data [dataS is the 
Associated structure array]:
datSvX = (dataS.y-yll)/cellsize
I get the error: 
% File expression not allowed in this context: DATAS.

Any suggestions would be appreciated.  It appears to me that Eric 
Korpela's VARRAY refered to in a thread earlier this week will not work 
on Win2000 Intel machines.  I run Win2000 on a PC with 1Gb RAM and lots 
of hard disk space.

Joseph E. Means
Assistant Professor,  joe.means@orst.edu
Department of Forest Science
Oregon State University
Corvallis, OR 97331-5752