The CMOS setup utility is a software program that is built into the firmware of a computer's motherboard. It allows users to configure various settings related to the computer's hardware and system setup. The CMOS setup utility is typically accessed by pressing a specific key during the boot process of the computer, which may vary depending on the motherboard and BIOS version.

In many cases, the key used to access the CMOS setup utility is the Delete (Del) key. When the computer is starting up, users can press the Del key to enter the CMOS setup utility and configure settings such as the system clock, boot order, memory settings, and other hardware-related settings.

Formatting a hard drive is a process of deleting all the data on it. When a hard drive is formatted, all the files and data on the drive are erased and the file system is set up to prepare it for new data to be written to the drive.

The term BIOS shadow is the copying of ROM contents to the RAM, where the information may be accessed more quickly by the CPU. This copy process is also known as Shadow BIOS ROM, Shadow Memory, and Shadow RAM.

BIOS shadowing is a technique used to improve the performance of a computer's BIOS (Basic Input/Output System). The purpose of BIOS shadowing is to copy the contents of the read-only memory (ROM) containing the BIOS code to a faster and more accessible RAM (Random Access Memory).

By copying the BIOS code from the slower ROM to the faster RAM, the computer can access the BIOS much more quickly, resulting in faster boot times and overall system performance. This technique was especially useful in older computers with slower ROM and limited RAM.

Restarting the computer is an important step after making changes to the system because it ensures that all the changes are applied properly and that the system is running smoothly. Restarting the computer can help to clear any temporary files or processes that may be causing issues, and it can help to ensure that any changes you made to the system are fully implemented.

Restarting the computer can also help to resolve any issues or errors that may have been caused by the changes you made to the system. For example, if you installed a new application or updated an existing one, restarting the computer can help to ensure that the changes are fully implemented and that any conflicts or compatibility issues are resolved.