What every digit means in software version (1.7.1.0, for example)?

Question

What could every digit mean in software version? (for example, 1.7.1.0) How do you numerate your versions?

Thank you.

Answer 1

It depends. Here is information on Microsoft Version Numbers http://en.wikipedia.org/wiki/Microsoft_Version_Number

We have used the last digit as build numbers for our applications.