Abstract: A computing device includes a processor that carries out actions comprising: storing a causal tree structure corresponding to a document, where the causal tree structure includes a sequence of editing instructions and each editing instruction is assigned an identifier unique to such editing instruction. The method further includes receiving a user editing instruction for the document, where the user editing instruction is assigned an identifier unique to the user editing instruction. The method includes storing the user editing instruction and the identifier assigned to the user editing instruction as an additional node to the causal tree structure. The method further includes broadcasting, to a plurality of client devices, the user editing instruction and the identifier assigned to the user editing instruction.

Abstract: A method is implemented on a server, the method includes storing, on a database of the server, a causal tree structure corresponding to a document, where the causal tree structure includes a sequence of editing instructions and each editing instruction is assigned an identifier unique to such editing instruction. The method further includes receiving, at the server, a user editing instruction for the document, where the user editing instruction is assigned an identifier unique to the user editing instruction. The method includes storing, using a processor of the server, the user editing instruction and the identifier assigned to the user editing instruction as an additional node to the causal tree structure. The method further includes broadcasting, to a plurality of client devices connected to the server, the user editing instruction and the identifier assigned to the user editing instruction.

Abstract: An extendable compartment assembly having a first compartment and a second compartment each having opposing sidewalls and a ceiling, a first frame coupled to the first compartment, a second frame coupled to the second compartment, and a slide assembly coupling the first frame to the second frame such that the second compartment is slideable relative to the first compartment between a first position and a second position. In the first position, the second compartment is at least partially disposed within the first compartment and in the second position the second compartment is at least partially disposed outside the first compartment. A hitch assembly comprising a base arm having first and second ends, a first mating arm coupled with the first end, a second mating arm coupled with the second end, and a bias member coupling the first mating arm to the second mating arm.