[users@httpd] REMOTE_USER not set for unprotected pages

[Tony Middleton <to...@echtrees.org.uk.INVALID>]

I wish to have two parts to a website:

Part that is protected by authentication (Require valid-user).

Part that is available to all but processing takes into account whether
the user has authenticated previously.

In the second part I am trying to identify whether the user has
authenticated by looking at REMOTE_USER but it appears that it is not
set for those parts not covered by Require valid-user.

Is there any way to require that REMOTE_USER be set even for unprotected
pages once a user/password has been entered?

Regards

Tony