HERA-B Framework for Online Calibration and Alignment
  This paper describes the architecture and implementation of the HERA-B framework for online calibration and alignment. At HERA-B the performance of all trigger levels, including the online reconstruction, strongly depends on using the appropriate calibration and alignment constants, which might change during data taking. A system to monitor, recompute and distribute those constants to online processes has been integrated in the data acquisition and trigger systems. 
J. M. Hernandez, D. Ressing, V. Rybnikov, F. Sanchez, A. Amorim, M.   Medinnis, P. Kreuzer, U. Schwanke