Please help cure a browser problem [telecom]

In order to read our site, please exit private/incognito mode or login to continue.

So, I'm in need of information about the incognito mode in Chrome.

1. How do these sites detect that I'm using the incognito mode?

1. Can I do something to prevent the sites detecting incognito mode?

2. Come to think of it, how do sites detect that I have an ad-blocker running?

TIA.

Bill