XAMPP on a LAN

[Pachat]

For demonstration purpose, on places where not Internet is available (and don't want to invest in several 3G now),
I'd like to show simultaneously the different views of a website (admin / registered / public) to my clients.
So I imagine to have 3 PC's connected through a LAN.

On each one XAMPP :

how do I manage to have PC 2 and PC 3 see the website (and MySQL) running on PC 1 ?

[Wiedmann]

how do I manage to have PC 2 and PC 3 see the website (and MySQL) running on PC 1 ?

Like with every other website... Open a webbrowser on PC2/PC3 with the address (ip or hostname) of PC1 (e.g. http://pc1/). (XAMPP must be started on PC1.)