Although the fifth-generation Intel Core i5 processor and Force Touch trackpad are minor updates, this year's 13-inch Retina Apple MacBook Pro is still an easy top pick for high-end ultraportables.... Read the full review on pcmag.com
Essentially, an Apple ID is your passport to the Apple ecosystem of hardware and software. It is an important information that smooths the interaction between you, your hardware, software and services that Apple provides.
I found http://support.apple.com/kb/HT4627 which states:  Removing an associated device or computer from an Apple ID. To remove a device or computer from your Apple ID: 1  Open iTunes. 2  From the Account Information screen, click Manage Devices.3  Click the Remove button next to the device name you would like to unassociate. .Removing an associated device or computer from an Apple ID. To remove a device or computer from your Apple ID: 1  Open iTunes. 2  From the Account Information screen, click Manage Devices.