Bounds of allocatable arrays

[Intel_C_Intel]

(8): Error: If dummy arg is allocatable, actual arg must be a whole array and not a section. 
If Arr will be in DLL but I will lie the interface of Arr like:
Code:
Interface
    Subroutine Arr(A)
        !DEC$ ATTRIBUTES DLLIMPORT, ALIAS : 'Arr' :: Arr
            
        integer A(:)
    end subroutine Arr
end interface
I.e. A will not be declared in interface as allocatable  all works!
And the second and main question: how Arr knows UBound of A!? Especially when Arr is a DLLs subroutine. And it doesnt matter if A is allocatable or integer A(:) (taking-form-array).
I hope someone will explain.
Stanislav