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Microsoft Resource Kits - Windows 2000 Resource Kit

Waitfor.exe  (Windows 2000 Resource Kit)

The Windows 2000 Resource Kits help IT professionals deploy, manage, and support Windows 2000 operating systems.
There are a number of Windows 2000 Resource Kit software tools available for free download from Microsoft. These tools are listed below, and can help you streamline administrative tasks such as managing Active Directory™, administering security features, working with Group Policy and Terminal Services, automating application deployment, and other important jobs.

Waitfor.exe
This command-line tool waits until a signal is given across the network. Multiple computers can wait for the same signal. The tool could be useful when testing builds of a piece of software, for example, as the build computer could send out a signal to several computers running WaitFor once the build has completed successfully. On receipt of the signal, the batch file including WaitFor could instruct the computers to immediately start running tests on the build.