I didn’t know it at all – until now.
PSR stands for “Problem Steps Recorder” and comes with Windows 7 & 8. The tool allows you to capture steps you take on your computer. Each step & mouse click is documented with a screen shot and small description of what you did in a single file which can then be used by a support guy – really helpful for reproducible problems. Awesome!
Give it a try – Start (or “Windows” + “R”) -> psr -> Go!
More information: How do I use Problem Steps Recorder?