A method of identifying suitable covering devices for installation at a window, such as a roof window, wherein the window comprises: - at least one first fastening mechanism configured to engage with a second fastening mechanism of a window covering device, and - an identification item comprising at least one machine-readable identifier, wherein the machine-readable identifier comprises identification data of the window, such as relating to the first fastening mechanism, and/or identification data of at least one window covering device having a second fastening mechanism configured to engage with the first fastening mechanism, wherein the machine-readable identifier further comprises destination data directed towards an online store, wherein the method comprises the steps of: - providing a mobile user terminal comprising an automatic identification reader, at the location of the window, - operating the automatic identification reader to retrieve the destination data and the identification data based on the machine-readable identifier, - providing a Uniform Resource Locator representation of a web address of the online store based on the destination data and the identification data to a web application, such as an internet browser, installed at the mobile user terminal, thereby providing the read identification data to a server at the web address, - receiving from the server, at the mobile user terminal, one or more web page results representing a selection of one or more window covering devices, wherein the selection of one or more window covering devices is based on the provided identification data, and wherein the selection of one or more window covering devices is/are configured for installation at the window by said selection of window covering devices having a second fastening mechanism configured to engage the at least one first fastening mechanism, - presenting, at a display of the mobile user terminal, the selection of one or more window covering devices, - wherein a user of the mobile user terminal operates a user interface of the mobile user terminal in order to purchase at least one window covering device of said presented selection of one or more window covering devices though said online store, - installing the purchased at least one window covering devices at said window comprising said identification item by means of the first fastening mechanism of the window and the second fastening mechanism of the purchased window covering device. - at least one first fastening mechanism configured to engage with a second fastening mechanism of a window covering device, and - an identification item comprising at least one machine-readable identifier, wherein the machine-readable identifier comprises identification data of the window, such as relating to the first fastening mechanism, and/or identification data of at least one window covering device having a second fastening mechanism configured to engage with the first fastening mechanism, wherein the machine-readable identifier further comprises destination data directed towards an online store, - providing a mobile user terminal comprising an automatic identification reader, at the location of the window, - operating the automatic identification reader to retrieve the destination data and the identification data based on the machine-readable identifier, - providing a Uniform Resource Locator representation of a web address of the online store based on the destination data and the identification data to a web application, such as an internet browser, installed at the mobile user terminal, thereby providing the read identification data to a server at the web address, - receiving from the server, at the mobile user terminal, one or more web page results representing a selection of one or more window covering devices, wherein the selection of one or more window covering devices is based on the provided identification data, and wherein the selection of one or more window covering devices is/are configured for installation at the window by said selection of window covering devices having a second fastening mechanism configured to engage the at least one first fastening mechanism, - presenting, at a display of the mobile user terminal, the selection of one or more window covering devices, - wherein a user of the mobile user terminal operates a user interface of the mobile user terminal in order to purchase at least one window covering device of said presented selection of one or more window covering devices though said online store, - installing the purchased at least one window covering devices at said window comprising said identification item by means of the first fastening mechanism of the window and the second fastening mechanism of the purchased window covering device.