Returns the previous symbol definition from the symbol library PrevSymDef(ObjectHandle : HANDLE) : HANDLE; Returns the next symbol definition from the symbol library NextSymDef(ObjectHandle : HANDLE) : HANDLE; Returns the handle of the previous deselected object in the list PrevDObj(ObjectHandle : HANDLE) : HANDLE; Returns the handle of the next deselected object in the list NextDObj(ObjectHandle : HANDLE) : HANDLE; Returns the handle of the previous selected object in the list PrevSObj(ObjectHandle : HANDLE) : HANDLE; Returns the handle of the next selected object in the list NextSObj(ObjectHandle : HANDLE) : HANDLE; Returns the handle of the previous object in the list PrevObj(ObjectHandle : HANDLE) : HANDLE; Returns the handle of the next object in the list NextObj(ObjectHandle : HANDLE) : HANDLE; Returns the handle of the previous layer in the list PrevLayer(LayerHandle : HANDLE) : HANDLE; Returns the handle of the next layer in the list NextLayer(LayerHandle : HANDLE) : HANDLE;