AppTerminate and AppTerminate()

I was trying to get a non-maxgui window to be closed when clicking on the "x"....

Strict

Graphics 800 , 600 , 0

Global x% = 0

Repeat
gameloop()
Until KeyHit(KEY_ESCAPE) Or AppTerminate

Function gameloop()
x = (X + 1) Mod 600
Cls
DrawText ( "O",x,100 )
Flip
End Function

The above code would run and then stop immediately, because I had typed AppTerminate not AppTerminate()

Which leads me to he question what is AppTerminate when not expressed as a function?

Either a function pointer, which will contain an address of the AppTerminate function, which will be non-zero, so will cause the loop to exit, or maybe AppTerminate by itself actually forces the app to terminate (I would think the first idea more likely).

Strict

Graphics 800 , 600 , 0

Global x% = 0

Global term() = AppTerminate

Repeat
gameloop()
Until KeyHit(KEY_ESCAPE) Or term()

Function gameloop()
x = (X + 1) Mod 600
Cls
DrawText ( "O",x,100 )
Flip
End Function

it's a function pointer.