http://www.seochat.com/c/a/Search-Engine-Optimization-Help/Identify-Web-Server-and-Scripting-Technology-for-Onsite-SEO/This is an important article for beginners in onsite search engine optimization. Before you accept any onsite SEO work, it is important that you know how to tweak the site. To be able to do that, you need to know the site's web server and scripting technologies. Does the site use Apache or Microsoft IIS? PHP, ASP, or Java? This article will explain why you need to know this, and how to find out.
Tweaking the site requires some skill with respect to the web server and scripting technologies used. Of course, if you are fully comfortable working with PHP on Apache web servers and have no idea of how to work with ASP.NET on a Windows server, then you should not accept any onsite SEO work for a Microsoft technology-based website.