A little help for the first use ?
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* Open a picture file (BMP, GIF and JPEG formats are supported)
* Wait until picture appears on the screen
* Menu Picture / Make Decal...
* Choose the game directory you want to use (Half-Life, or cstrike (for Counter-Strike), or TFC....).
* Read with attention the Information Notice Screen (at least the first time please !)
* That's all !!!.
* Create a lan game in Half-Life (or Counter-Strike, TFC....) to test the decal.

VERY IMPORTANT : 
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- NEVER RETURN TO THE 'CUSTOMIZE' MENU OF HALF-LIFE (OR CSTRIKE....) .
  (Otherwise, default Half-Life Decal will overwrite your custom Decal).

- IN ORDER TO USE THE CORRECT DECAL, YOU HAVE TWO CHOICES : 
     * START THE APPROPRIATE WINDOWS SHORTCUT. 
        (Ex: Counter-Strike Shortcut to use Counter-Strike decal)
     * USE THE ACTIVATE MENU IN HALF-LIFE.
  ---> (That means too that you can provide a different decal for each Half-Life Mod !!!)