It allows you to match the software ID to the sticker on the case.
It can create a unique identifier for the machine. It allows you to match the software ID
A machine with a matching internal S/N is more valuable. It allows you to match the software ID
Always keep the laptop plugged into AC power. A shutdown during an EEPROM write can be fatal for the motherboard. It allows you to match the software ID
The HMD is a bootable tool designed for low-level hardware configuration. When you swap a ThinkPad motherboard, the new board is often "blank." Without this tool, the system won't know its own identity.
Necessary when sourcing parts from "parts machines."