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Performs regression analysis for longitudinal count data, allowing for serial dependence among observations from a given individual and two dimensional random effects on the linear predictor. Estimation is via maximization of the exact likelihood of a suitably defined model. Missing values and unbalanced data are allowed. Details can be found in the accompanying scientific papers: Goncalves & Cabral (2021, Journal of Statistical Software, doi:10.18637/jss.v099.i03) and Goncalves et al. (2007, Computational Statistics & Data Analysis, doi:10.1016/j.csda.2007.03.002).