Abstract: The disclosure provides a method for collaboratively operating shared content in a video conference, wherein the shared content is shared by a sharing terminal to a shared terminal. In the method, an operation event is transmitted by the shared terminal to the sharing terminal. The operation event is then transmitted to a virtual device of the sharing terminal, and the operation event is performed on the shared content by the virtual device.

Abstract: A method for switching shared content in a video conference includes determining a status of the video conference when a switch event is triggered. If the status is a video status, sharable content of the sharing terminal are detected, and whether the sharing terminal has at least one sharable content is determined. If so, one of at least one sharable content is shared with at least one remote terminal. If not, the status keeps being in the video status. If the status is a sharing status and the sharing terminal shares a content having a first index number, sharable content of the sharing terminal are detected, and whether the sharing terminal has a first sharable content having an index number larger than the first index number is determined. If so, sharing the first sharable content with at least one remote terminal by the sharing terminal.

Abstract: The invention provides an optical touch device, including a main body, a keyboard and a light emitting member. The keyboard, placed on the main body and having a first end portion and a second end portion, includes a supporting frame, a keycap and a stopping member. The keycap is connected to the supporting frame and moves between a first position and a second position. The stopping member is connected to the keycap and moves simultaneously with the keycap. The light emitting member generates a light beam to the keyboard. When the keycap is in the first position, the light beam passes through the first end portion to the second end portion, and when the keycap is in the second position, the light beam is terminated by the stopping member, such that the light does not reach the second end portion.

Abstract: A bit rate control apparatus applied in a video conference system is provided. The apparatus has a bit rate recording unit, configured to update a current bit rate; a bit rate reducing unit, configured to receive at least one event parameter and the current bit rate, and determine whether an event flag corresponding to the event parameters occurs; and a bit rate increasing unit, configured to increase the current bit rate periodically, wherein when the event flag occurs, the bit rate reducing unit reduces the current bit rate.