Animated and translucent bitmap

from Stardock Forums
Looking at some of the objects such as the Control Panel and Death Star Plans I see that the image is .BMP yet animated or transparent. Mind you before this point I'd never eve realized either was possible but that appeares to be the case. How are either of these done?
desktopx
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Reply #1 from WinCustomize Forums Top
To create complex blending effects you need to create a double-height bitmap where the bottom half contains greyscale alpha blending values. Dark areas are more transparent and pale area are more visible. You must use this type of image in conjunction with per-pixel alpha blending.