Notebook:

	Check the sticker on the underside of your computer. The serial number is the sequence of characters after the abbreviation "SN:" (10 characters).
	Check the sticker on the underside of your computer. The serial number is the sequence of characters above the bar code (15 characters).

Personal Digital Assistant (PDA):

Check the sticker on the bottom or back of the PDA. The serial number is the sequence of characters below the barcode.

Smartphone:

Check the sticker on the back of the smartphone. The serial number is the sequence of characters below the bar code, after the abbreviation "SN:".

Eee PC:

Check the sticker on the underside of the Eee PC. The serial number is the sequence of characters below the bar code, after the abbreviation "SN:".

All-in-One PC:

Check the sticker on the back of the All-in-One PC, next to the I / O panel. The serial number is the sequence of characters below the bar code, after the abbreviation "SN:".

Eee Pad:

	Check the sticker on the product or on the packaging. You can also check the sticker on the warranty card. The serial number is the sequence of characters below the bar code, after the abbreviation "SN:".
	Check for the serial number in "Settings" -> "About the tablet" -> "Status"

In General:

The serial number is present on the computer packaging and in the bios OR you can launch the DOS command prompt in Windows.

To launch DOS: you have to right click on the Windows logo (start menu) -> click on "Execute" -> type "CMD" -> and enter the following command line:

wmic csproduct get name, identifyingnumber