Futurebasic/Language/Reference/line

Description
This function looks for the indicated  in your program, and returns the memory address of the first program instruction that follows the label. The returned address can be used with the  statement (in cpu68K compiles). If you want to use  in this way, the label should indicate the beginning of an   procedure.

Note: To get an entry point address for an  procedure which is to be used as a "callback procedure" for a MacOS Toolbox routine, use the   function instead.