How to find your unique Discord ID, and what you can use it for

A Discord ID is a unique 18-digit number that's tied to your account, every message you send, and every server that you join.

How to join a Zoom meeting with an invite link or Meeting ID on any device

It's easy to join a Zoom meeting by clicking an invitation link or entering your Meeting ID. Here's how to do it on desktop and mobile.
Ars Technica

Java - Get a unique ID for a computer

I'm working on a Java app that runs off of a flash drive. It needs to be able to get a unique identifier for each computer it runs on. The next time it runs on the computer, it should be able to ...
SlashGear

How To Change Your Apple ID In The App Store

To start using a brand-new Apple device — such as an iPhone, iPad, Apple Watch, Apple TV, or Mac computer, among others — you need to set it up using an Apple ID. This pertains to your personal ...