The VAT server was a service related to the paper:
VAT: a computational framework to functionally annotate variants in personal genomes within a cloud-computing environment.
L Habegger, S Balasubramanian, DZ Chen, E Khurana, A Sboner, A Harmanci, J Rozowsky, D Clarke, M Snyder, M Gerstein (2012). Bioinformatics 28: 2267-9.