siding accessory extends from the siding board and has at least a portion located inside an interior of the siding board item 45 the siding product of item 41 wherein the siding accessory is mounted only to an exterior of the siding board item 46 the siding accessory of item 45 wherein the siding accessory is bonded to the exterior of the siding board item 47 the siding product of item 41 wherein the channel has a first axial sectional shape and an upper end of the course of siding has a second axial sectional shape that is either complementary to or not complementary to the first axial sectional shape this written description uses examples to disclose the embodiments including the best mode and also to enable those of ordinary skill in the art to make and use the invention the patentable scope is defined by the claims and may include other examples that occur to those skilled in the art such other examples are intended to be within the scope of the claims if they have structural elements that do not differ from the literal language of the claims or if they include equivalent structural elements with insubstantial differences from the literal languages of the claims note that not all of the activities described above in the general description or the examples are required that a portion of a specific activity may not be required and that one or more further activities may be performed in addition to those.