This is a port of the macbill, which is based on xbill, source to gnustep.

ever get the feeling that nothing is going right? you're a sysadmin, and someone's trying to destroy your computers. the little people running around the screen are trying to infect your computers with wingdows [tm], a virus cleverly designed to resemble a popular operating system. your objective is to click the mouse on them, ending their potential threat. if one of the people reaches a computer, it will attempt to replace your operating system with the virus it carries. it will then attempt to run off the screen with your vital software.