R_DefPal()      Installs the default Clipper colour palette
 R_GetRGB()      Determines the composition of a specific colour
 R_IsEGA()       Determines if an EGA card is present
 R_IsMCGA()      Determines if a MCGA card is present
 R_IsSVGA()      Determines if a SuperVGA adapter is available
 R_IsVGA()       Determines if a VGA card is present
 R_PCXInfo()     Gets information of a specific PCX-file
 R_RestPal()     Restores a saved Clipper colour palette
 R_SavePal()     Saves the actual Clipper colour palette to a string
 R_SetRGB()      Changes the composition of a specific colour
 R_ShowPCX()     Shows a PCX-file on EGA/VGA/SuperVGA screens
 R_VGACard()     Determines which SuperVGA adapter is present
 R_VMGet()       Determines the actual video mode
 R_VMSet()       Changes the actual video mode