A method of directing a user to an online store by means of a mobile user terminal in order for a user to purchase a window covering device at an online store for installation at a window such as a roof window, for a building, wherein the window comprises: - a window pane and a frame, wherein the pane is arranged in the frame; the method comprising the steps of providing a removable representation item comprising a visual representation of a window covering device, wherein the removable representation item covers at least a first part of the window pane, and wherein the visual representation illustrates a window covering device mounted at the window, providing the window with a removable identification item (120,130) comprising at least one machine-readable identifier, wherein the machine-readable identifier comprises a Uniform Resource Locator representation which is directed to a web address, and wherein the machine-readable identifier comprises identification data of the window and/or identification data of the at least one window covering device represented by the visual representation, providing a mobile user terminal at the location of the window, operating an automatic identification reader of the mobile user terminal so that the automatic identification reader reads the machine-readable identifier, obtaining the Uniform Resource Locator and the identification data based on the read machine readable identifier, wherein said web address is a web address at an online store, providing the read identification data to a server at the web address by means of the mobile user terminal based on the read Uniform Resource Locator representation, and presenting, at a display of the mobile user terminal, a web page result of window covering devices suitable for installation at the window based on the provided read identification data, wherein the window covering devices presented at the display are available for purchase through said online store. - a window pane and a frame, wherein the pane is arranged in the frame; the method comprising the steps of providing a removable representation item comprising a visual representation of a window covering device, wherein the removable representation item covers at least a first part of the window pane, and wherein the visual representation illustrates a window covering device mounted at the window, providing the window with a removable identification item (120,130) comprising at least one machine-readable identifier, wherein the machine-readable identifier comprises a Uniform Resource Locator representation which is directed to a web address, and wherein the machine-readable identifier comprises identification data of the window and/or identification data of the at least one window covering device represented by the visual representation, providing a mobile user terminal at the location of the window, operating an automatic identification reader of the mobile user terminal so that the automatic identification reader reads the machine-readable identifier, obtaining the Uniform Resource Locator and the identification data based on the read machine readable identifier, wherein said web address is a web address at an online store, providing the read identification data to a server at the web address by means of the mobile user terminal based on the read Uniform Resource Locator representation, and presenting, at a display of the mobile user terminal, a web page result of window covering devices suitable for installation at the window based on the provided read identification data, wherein the window covering devices presented at the display are available for purchase through said online store.