Uses of Class

Packages that use User
Beef up the plain text console output by adding HTML markup.
Core object model that are bound to URLs via stapler, rooted at Jenkins.
Jenkins's interface with source code management systems.
QuickSilver-like search/jump capability for better navigation around Jenkins.
Security-related code.
Code related to agents.
Built-in Builders and Publishers that perform the actual heavy-lifting of a build.