Hi, 

 I wanted to perform some simulations backward and forward in time (for
transition path sampling ). If I specify a negative value for 'dt' in the 
mdp file, would that work for backward integration of the equations of
motion ? 

Thanks 
Sumanth N Jamadagni
Graduate Student 
Isermann Dept of Chemical and Biological Engg
Rensselaer Polytechnic Institute