- Suitable for simple designs only.  Titlebar buttons are fixed in the normal Windows 95/98/NT/2000 locations.  No support for custom button actions.
- The advanced format.  Designed to be simple to use and yet powerful for those who wish to use the advanced features.  Supports custom window shapes, custom border widths, custom button actions and locations.
- Works in conjunction with UIS2 files.  These can be programmed in C or any language which can produce standard Windows .DLL files.  Visual Basic CANNOT.  The fading clock is an example of a UIS2 plugin.

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