Identify Sharepoint Site

Question

How can we know that a site is a Sharepoint Site?

Answer 1

Because its bloated and slow? Just kidding.

If you mean as a user, you can do a view source and there are several indicators, such as

<meta name="GENERATOR" content="Microsoft SharePoint" />

Answer 2

I will try these to check if a site is a Sharepoint site

1) Check Url, if it has /sites/ in the url

2) check if accessing [ServerName]/_layouts/images/ERROR.GIF gives a Image

3) check if accessing [ServerName]/_vti_bin/sites.asmx?wsdl will display wsdl for the webservice

4) check if source has
< meta name="GENERATOR" content="Microsoft SharePoint" >

5) check if source show usage of init.js, core.js

6) check if _spBodyOnLoadWrapper function is being called on page load.