application center test (act) is a microsoft load testing tool for web servers, focused on asp.net. it simulates numerous http sessions from one machine. using a bank of multiple computers, all firing off repeated http requests, a significant load can be simulated. tests can be written in either of the microsoft scripting languages: vbscript and jscript. the tool can also be used for functional testing, although that is not what it is designed for. it also contains a recording function to create test cases without having to program them in.