All you need is:
- a computer with a navigator (like Internet Explorer, included in Windows),
- the 'Flash' plugin (it generally installs itself automatically on your navigator),
- a webcam,
- an internet line, if possible an ADSL type of line for a better image quality
and that's all!

There is no software to install.
All you have to do is visit the site with your model login!
The entire system is in Flash, which means that it's not exactly hard to visit a website anymore!