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What is it? Trinux: A Linux Security Toolkit was a ramdisk-based Linux distribution that was under active development from 1998-2003. This new project (i.e. ubuntutrinux) seeks to integrate elements (and code, where appropriate) of Trinux with the Debian/Ubuntu mkinitramfs infrastructure to allow easy development and packaging Ubuntu binary (and ultimately package and repository) compatible ramdisk distributions using recent 2.6.x kernels.
ubuntutrinux - Google Code
Windows PE 2.0: a tiny version of Windows for system maintenance
Few people know it, but when you boot off the Vista install DVD, you're booting into a different version of Windows altogether: Windows PE 2.0. Stripped away from the Vista installer, it's a remarkably powerful, compact OS.