What the last field in web server log data is about?

Question

Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 5.1; .NET CLR 2.0.50727; .NET CLR 1.1.4322)

In web server log file, last field contains above information i.e. user agent. But here .NET CLR 2.0.50727; .NET CLR 1.1.4322 mentioned 2 version. From which version the web user has requested the web page? Why 2 version of .NET are mentioned here?

Answer 1

It is possible to have more than one .NET CLR installed on a machine.
CLR + libraries and tools = .NET Framework

This UserAgent String indicates that both are installed - the request is sent by the browser that identified it self with this UA.

See for https://www.google.com/search?q=user+agent+string+.Net+CLR