A system , comprising: an image display device configured for being head-worn by a user; and an apparatus , comprising: a screen ; a processing unit configured to assign a first area of the screen to sense finger-action of the user; and an orientation sensor for sensing an orientation of the apparatus , wherein the processing unit is configured to generate an electronic signal to cause a change in a content displayed by the image display device based on the finger-action of the user sensed by the assigned first area of the screen of the apparatus , wherein the processing unit is configured to obtain an input signal associated with a swiping action performed on the assigned first area of the screen ; wherein the processing unit is configured to generate the electronic signal to cause the content to change by moving the content in response to the input signal associated with the swiping action; characterised in that the processing unit is further configured to generate the electronic signal to cause the content displayed by the image display device to change based on the input signal associated with the swiping action and the sensed orientation of the apparatus . an image display device configured for being head-worn by a user; and an apparatus , comprising: a screen ; a processing unit configured to assign a first area of the screen to sense finger-action of the user; and an orientation sensor for sensing an orientation of the apparatus , wherein the processing unit is configured to generate an electronic signal to cause a change in a content displayed by the image display device based on the finger-action of the user sensed by the assigned first area of the screen of the apparatus , wherein the processing unit is configured to obtain an input signal associated with a swiping action performed on the assigned first area of the screen ; wherein the processing unit is configured to generate the electronic signal to cause the content to change by moving the content in response to the input signal associated with the swiping action; characterised in that the processing unit is further configured to generate the electronic signal to cause the content displayed by the image display device to change based on the input signal associated with the swiping action and the sensed orientation of the apparatus . a screen ; a processing unit configured to assign a first area of the screen to sense finger-action of the user; and an orientation sensor for sensing an orientation of the apparatus , wherein the processing unit is configured to generate an electronic signal to cause a change in a content displayed by the image display device based on the finger-action of the user sensed by the assigned first area of the screen of the apparatus , wherein the processing unit is configured to obtain an input signal associated with a swiping action performed on the assigned first area of the screen ; wherein the processing unit is configured to generate the electronic signal to cause the content to change by moving the content in response to the input signal associated with the swiping action; characterised in that the processing unit is further configured to generate the electronic signal to cause the content displayed by the image display device to change based on the input signal associated with the swiping action and the sensed orientation of the apparatus . <EOS>