Tip 148, introduced the subject.

BrowStat is a general purpose, character-based browser diagnostic tool. Use BrowStat to find out whether a browser is running ...... This utility also provides information about the state of the browser in a workgroup, including the name of the master browser.

Microsoft has written a Knowledge Base article entitled:

Q188305 -Troubleshooting the Microsoft Computer Browser Service, which discusses the use of BrowStat to troubleshoot Windows NT Browser problems.