PHP on multiple machines

[Anon]

We have a content management system (Closed User Group) that should let you easily add and remove applications.
The system consists mainly of one single system that handles ['login', 'logging', 'body_header.inc', 'body_footer.inc','listofapplications.conf']

One solutions is to use frames or even iframes (that's ok), and to, in the iframe say that if parent frame isn't admin system=>break!
But we don't want to do client side stuff.

The other alternative is to use fopen().

mothersystem.php

include listofapplications.conf
include body_header.inc

fopen($listofapplications[x])
read_and_print_all()

include body_footer.inc

/mothersyste.php

However, this solution might be very performance depriving and difficult to control, when a lot of form requests are being sent.

Does anybody have any good hints on multiple machine PHP development??

[Anon]

Use a database for session information, that way you can authenticate the user before any output and all computers can read from the same database.

[Anon]

No, I think we are going to use a Firewall for that.
I.e. The child system is manually set up so that only the mother system can use fopen() (which is a sense a sort of browser)