Unique IDs in Windows
71514
Generating a unique machine id
126401
How is uniqueness of MAC addresses enforced?
67406
Changing the generated ASP.Net  id?
15510
How do I uniquely identify computers visiting my web site?
45300
How to prevent duplicate usernames when people register?
34466
Encrypt IDs in URL variables
140456
Why is the ##UserID## parameter not populated in Data Explorer anymore?
153059
How to Create a Custom ID in Access 2010
22939
Is there a unique Android device ID?
113339
Use Windows Live ID, but login with a different password
31718
Generating a globally unique identifier in Java
29367
T-SQL stored procedure that accepts multiple Id values
31395
Exposing database IDs - security risk?
53549
Unique and temporary file names in PHP?
82467
##UserId## parameter is no longer automatically filled on Data Explorer
145311
Generate an increment ID that is unique for a given value of a foreign key
39518
How unique is the php session id