I'm faced wit a rather unusual situation...

We developed a site on a small local network to give journalists acces to realtime information.
We setup their laptops in the morning and startup Opera in kioskmode and direct them to the site. From then on we have no more acces to the press area.

After that we setup our own programs wich export .XML files to the server wich is then displayed on all the screens.

The system works fine for one thing:
When we setup our software, we send testfiles to the servers to check if everything is working. Thes testfiles are also displayed on the other laptops with some confusion as a result.

My question:
Can I temporarily block the site for all users except one (my test account) and then deblock the info when everything has been tested (without the users having to reload the page)?

If yes, how can I do this?

Probably an uncommon thing to ask, but I would be really gratefull for any suggestions.

Kind regards,