A method for modifying a composite video signal generated by a video composing server, said composite video signal being a spatial mix of two or more video conference streams, characterized in: displaying on a touch screen a graphical representation of said composite video signal, where said graphical representation comprises two or more graphical objects, where each graphical object represents one of said video conference streams, and where said two or more video conference streams and said two or more graphical objects are arranged in a corresponding order and corresponding relative positions and sizes; where the step of displaying further comprise the steps of: receiving a layout configuration describing the currently generated composite video signal, from the video composing server, and generating a graphical representation based on said layout configuration describing the currently generated composite video signal; receiving input from a user using said touch screen to modify the graphical representation; modifying said composite video signal to conform with said modified graphical representation, where said composite video signal conforms with said modified graphical representation when said video conference streams are spatially mixed according to the order and/or position and/or size of the graphical objects on the touch screen; where the step of modifying said composite video signal further comprise the steps of: generating a layout configuration based on the order and/or position and/or size of the graphical objects on the touch screen, sending a command or signal comprising said layout configuration based on the order and/or position and/or size of the graphical objects on the touch screen, to said video composing server, and instructing said video composing server to modify the composite video signal according to said layout configuration based on the order and/or position and/or size of the graphical objects on the touch screen. displaying on a touch screen a graphical representation of said composite video signal, where said graphical representation comprises two or more graphical objects, where each graphical object represents one of said video conference streams, and where said two or more video conference streams and said two or more graphical objects are arranged in a corresponding order and corresponding relative positions and sizes; where the step of displaying further comprise the steps of: receiving a layout configuration describing the currently generated composite video signal, from the video composing server, and generating a graphical representation based on said layout configuration describing the currently generated composite video signal; receiving a layout configuration describing the currently generated composite video signal, from the video composing server, and generating a graphical representation based on said layout configuration describing the currently generated composite video signal; receiving input from a user using said touch screen to modify the graphical representation; modifying said composite video signal to conform with said modified graphical representation, where said composite video signal conforms with said modified graphical representation when said video conference streams are spatially mixed according to the order and/or position and/or size of the graphical objects on the touch screen; where the step of modifying said composite video signal further comprise the steps of: generating a layout configuration based on the order and/or position and/or size of the graphical objects on the touch screen, sending a command or signal comprising said layout configuration based on the order and/or position and/or size of the graphical objects on the touch screen, to said video composing server, and instructing said video composing server to modify the composite video signal according to said layout configuration based on the order and/or position and/or size of the graphical objects on the touch screen. generating a layout configuration based on the order and/or position and/or size of the graphical objects on the touch screen, sending a command or signal comprising said layout configuration based on the order and/or position and/or size of the graphical objects on the touch screen, to said video composing server, and instructing said video composing server to modify the composite video signal according to said layout configuration based on the order and/or position and/or size of the graphical objects on the touch screen.