In one general aspect, a computer-readable storage medium can store instructions that when executed cause a client device to perform a process. The instructions comprising instructions to define a plurality of event packets where each event packet from the plurality of event packets includes an input value from a user interface device associated with the client device, and instructions to define, at a first time, a first carrier packet including the plurality of event packets. The instructions can also include instructions to define an additional event packet representing an additional input value from the user interface device associated with the client device, and define, at a second time, a second carrier packet including the additional event packet and at least a portion of the plurality of event packets.