Abstract: A method for tracking a sent message in a distributed messaging system is presented. The method includes providing a sequence of data structures that when queried have a known probability of returning a false positive result and creating a message history by associating a range map with each of the sequence of data structures, where the range map includes a range of time stamps. The method further includes providing a message tracking ID corresponding to the sent messages, where the message tracking ID includes a client ID, a message time stamp that includes a bounded skew, and a server ID. The method further includes storing the message tracking ID in one of the sequence of data structures.

Abstract: A stand system tilts a monitor up or down. The stand system can move the monitor manually or through one or more motors. The stand system has a base and a neck. The an arc configuration that slides on one or more rollers. The base may be engaged with a mechanism that slides the base along the rollers following the arc configuration of the base. The gear mechanism may be coupled to a motor to slide the base on the roller through a motorized action.