Can BlitzMax call a function from a pointer?

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Leadwerks

I think it works.

Declare an OpenGL function to get the pointer to an extension function:

Extern "Win32"
Function wglGetProcAddress:Byte Ptr(lpszProc$z)
EndExtern

Get the pointer to the GL extension function:

Local POINTER_wglSwapInterval : Byte Ptr
POINTER_wglSwapInterval=wglGetProcAddress("wglSwapIntervalEXT")

Declare a function out of the pointer:

Local wglSwapInterval(interval)=Byte Ptr(POINTER_wglSwapInterval)
wglSwapInterval 0

Should the function be declared global so that I can use it anywhere?