'Field Owner.Window' just says that the variable called 'Owner' is a pointer to a 'Window Type'.
Just remember that the suffix '.Window' simply specifies what kind of variable 'Owner' is in exactly the same way as $ denotes a string variable, # a floating point variable, % an integer, etc.
Just remember that the suffix '.Window' simply specifies what kind of variable 'Owner' is in exactly the same way as $ denotes a string variable, # a floating point variable, % an integer, etc.