Does TestComplete support testing of applications that use ASP, ASP.NET, CGI, ISAPI or PHP on the server side?

Yes. The fact is that TestComplete Enterprise tests the client side of web applications and does not depend on the technology used on the server side. We would like to note that TestComplete 6 provides a special Tree model that simplifies the testing of web pages produced by ASP.NET, PHP and other servers. This model reflects the actual parent-child relationship between HTML elements on the web page and addresses an object via its parent objects rather than via the document.all collection or the tag collection. This enables TestComplete to locate the desired element faster than it would when using the DOM or Tag models. That is why we recommend that you use the Tree model for testing dynamically created web pages.