ATLAS and CMS

This talk describes the B-physics trigger systems for the ATLAS and CMS experiments. 
The LHC will produce B events at an unprecedented rate allowing the possibility to study rare decays. 
Due to the high event rate at the LHC the trigger systems are required to be very selective, reducing the rate
by about six orders of magnitude for recording. The B-trigger must be able to reject the non-B background
(only about one collision  in a  hundred will produce a b-bbar pair) and select the B-decay channels of
specific interest (often with low branching ratios). In adition the B-trigger must be flexible enough to 
 cope with increasing luminosity during the period of LHC running. The different strategies used to achieve 
this flexibility are covered by this talk.