Attached Link: Memory Support and Windows Operating Systems

The question of maximum RAM for Windoze XP came up in this thread. 

I found that the microsoft site had a rather confusing answer to that
question.  (in fact, I wonder if the writer's native tongue is English --
either side of the pond!). 

As I understand it, windoze XP will support 4GBy RAM.  However, 2GBy
will be used by the kernel and the maximum that an application can have
allocated is also 2GBy. 

That having been said, there is a switch called "/3GB" in boot.ini -- but I
will need to read the microsoft page a few more  times to understand what
that switch really does. 

HTH

--
Martin