Team Suite: Visual Studio Team System (VSTS) uses Team Foundation Server (TFS) as the data storage and collaboration backend. TFS provides a source control repository, work item tracking and reporting services. TFS works on "work items", which are a single unit of work which needs to be completed. Items themselves can be of several different types, such as a Bug, a Task, a Quality of Service Requirement, a Scenario, and so forth. The framework chosen for any given project in a TFS defines what types of work items are available and what attributes each type of work item contains
TFS source control system stores all code, as well as a record of all changes and current check-outs in a SQL Server database. It supports features such as multiple simultaneous check-outs, conflict resolution, branching and merging, and the ability to set security levels on any level of a source tree. TFS uses SQL Server Reporting Services to create reports including the rate of code change over time, lists of bugs that don't have test cases, regressions on previously passing tests, and so on. The reports can be in various formats including XML and PDF.
TFS also includes a build server which can be used by developers to do a complete build of the most recent bits contained in source control. All build events are tracked by TFS as well. Visual Studio's Code Analysis, Test Tools and Code Coverage can be enabled to validate a build before it is deemed to be "good".
Team Test Load Agent:
In addition to Team Foundation Server, Microsoft also offers a server component called Team Test Load Agent. This tool, which is licensed separately from Team Foundation Server and Visual Studio, is intended for use by testers to perform automated load testing on a web or Windows application. Microsoft advertises that a "typical PC" can support simulating 1,000 simultaneous users. The results of load tests are stored in the Team Foundation Server warehouse, and can be linked to specific builds so that performance testing can be tracked over the lifetime of a project
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http://teamsystemrocks.com/tutorials/