A desk that contains an integrated computer. The memory controller generates a data frame that includes a plurality of commands. The curb is mounted beneath the header and includes two curb rails and a threaded curb expansion assembly coupled to the curb rails. For a given version of a data set, new information is stored along with metadata used to reconstruct the version from each individual segment saved at different points in time. The system further comprises a control unit that processes a time series output by the mass spectrometer for a received sample and identifies one or more agents contained in the sample.