Abstract: A locking device (10) for securing a heat sink to an electronic device includes a rectangular main frame (20), four first fasteners (30) respectively pivotably attached to four corners of the main frame and two second fasteners (40) pivotably attached to the main frame at opposite sides thereof. Each of the first and second fasteners respectively is capable of rotating relative to the main frame from a non-stretched position to a stretched position for attachment of the heat sink to the electronic device.

Abstract: In a system for performing an action regarding an account in response to an electronic communication received from a sender by a receiver, wherein the electronic communication includes sender identity information associated with the account and a digital signature derived using a private key of a public-private key pair, and wherein the public key has been associated with the account by the receiver such that the public key is retrievable based on the sender identity information, a method of validating the identity of the sender for the electronic communication includes: (a) retrieving the public key based on the received sender identity information; and (b) comparing a function of the public key and the digital signature with a function of the electronic message. The digital signature is derived from an electronic message possessed first by the sender before the receiver. The sender identity information is different from the electronic message.

Abstract: A pointer control device includes a housing and a keypad mounted on the housing. A movable guide member extends over the keypad. The movable guide member is operable for being moved over different locations of the keypad. The movable guide member causes a direction control signal to be generated to control a display screen pointer. A pointer control mechanism is positioned along on the movable guide member. The pointer control mechanism is movable along the movable guide member and movement of the pointer control mechanism provides a direction control for the display screen pointer. The housing unit may be a remote control unit with a set of function keys operable to select one of a plurality of modes of operation of a computer system. The function keys may be operable to select a television mode, network communication mode or a video cassette recorder mode. The keypad over which the pointer control mechanism move may be a typewriter style keypad on the remote control.