Virtual memory support in Windows NT uses a system page file to swap pages from
memory of different processes onto disk when they are not being actively used.
On a running system, the page file is opened exclusively by the operating system
and is well-protected. To ensure that any sensitive information from process
memory is not left on the hard drive and thus not available to a user booting
the server with another operating system, apply the following Windows NT
registry hack: Clear Page File. This
could be particularly valuable on shared PCs. Note that this protection only
works with a clean shutdown. The ClearPageFileAtShutdown
is part of the normal shutdown process when this value is set.