Migrate CE5 AP to CE6

Hi,
I had some applications written in CE5 directly include Pkfuncs.h in
"C:\WINCE500\PUBLIC\COMMON\OAK\INC". It is using VirtualAlloc() and
VirtualCopy() to access some memory mapped registers.

In CE6.0 it doesn't work any more. Can anyone help to suggest my options? Is
there a replace function or I have to write a driver and change my
application to call it.

Thanks.
.