Unfortunately, this useful tool hasn't been updated for several years.
Note: it seems that the software hasn't been updated for several years - the version linked to this page is the latest to exist.
Windows has a function called "Task manager" that allows you to end a running program. However, some places (like offices or schools) have their own task managers in order to avoid misuse - but they can also disable the funtionality of ending processes. It is in that case that this stand-alone tool can be very useful and allow you to end a program.