Cudder's Wet Dream

Those are the main concepts behind Solar_OS:

Really simple inside and simple outside
Easy to understand and highly organized
Small, Fast, RealTime
Has minimal hardware requirements
Fast standard GUI: windows inside windows inside windows, event driven.
Fully ASM OS
Provides a clean, small, simple and very fast to boot OS with the typical features of a GUI desktop OS.

http://www.oby.ro/os/over_view/os_over_features.htm

Kernel code including applications and GUI without data is under 512K.
Code reusability at maximum: app code is really shared by multiple instances.
Designed to be fully re-entrant.

CUDDER QUALITY