where does VarPtr point to?

If you had an int,

Local x:int = 5

and you had a C function - void myFunc( int x )

Extern
    Function myFunc( x:Int )
End Extern

you could pass x into the function with

myFunc(x)

If the C function was - void myFunc( int * x )

Extern
    Function myFunc( x:Int Ptr )
End Extern

you could pass it into the function with

myFunc( Varptr x)


For Strings... it depends on the context. I've found occasions where I can define my Extern as myString:Byte Ptr, and simply pass the string into the function itself.
In other places I convert to a CString first...