NXC  Version 1.2.1 r5
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This is an example of how to use the DisplayEraseMask, DisplayUpdateMask, DisplayDisplay, DisplayFlags, DisplayTextLinesCenterFlags functions, SetDisplayEraseMask, SetDisplayUpdateMask, SetDisplayDisplay, SetDisplayFlags, and SetDisplayTextLinesCenterFlags functions,

task main()
unsigned long addr = DisplayDisplay();
NumOut(0, LCD_LINE3, addr);
// setting the display address function can be ... dangerous
// fiddling with the display flags is also dangerous
unsigned long flags = DisplayFlags();
flags = flags & (~DISPLAY_POPUP);