NULL:
This is not so much a function as a constant with no value. This can be used to clear out a variable, but is really designed for use with external DLL calls to pass NULL values.
X = NULL
Note that you cannot do a comparison to NULL. Use the IsEmpty() function instead.
RGB(Red, Green, Blue):
This function creates a singular RGB color number out of the three color components. The three components each can range from 0 to 255.
Examples:
RGB(0,0,0) is black
RGB(255,255,255) is white
RGB(255,0,0) is red
RGB(0,255,0) is green.
To provide the user with a color selection dialog, see System.ColorSelectDialog()
