The author's purpose is to help the computer owner that has inadvertently lost or forgotten the password to their system. Another possibility is somebody being the victim of a disgruntled employee or some other malicious party. As a form of sabotage, a devious person will slap on a password. With a PS2 system, when it shows a logo of a skeleton key right after the computer is powered up, it's requesting the password to be entered. You'll have to reset the machine.
Flakey systems can intermittently enable the password.
The default password often acts as a master password. This is always worth trying. The BIOS might prevent the computer from booting without the input of the correct characters. In the IBM PS2 55SX, reversing the speaker connector, thus shorting pins 5 and 6, will clear the password. With this model, since the battery and the CMOS are the same component, there is no other way to remove a password, if you don't already know it.