InitGraphic
DefineWorld
SelectWorld
DefineWindow
SelectWindow
PointDrawn
DrawStraight
FindWorld
RotatePolygonAbout
TranslatePolygon
ScalePolygon
LoadScreen
LoadWindow
WindowSize
ClearWindowStack
StoreWindow
RestoreWindow
CopyWindow
DrawPolygon
DrawHistogram
Spline
LoadWindowStack
RemoveHeader
MoveVer
MoveHor
SaveWindow
SaveWindowStack
SaveScreen
ERROR.MSG missing
Font file missing
Index out of range
Coordinates out of range
Too few array elements
Error accessing file
Out of window memory
Value(s) out of range
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