[gmx-users] External Forces

[toma0052]

Hello,
     I am simulating a DPPC lipid bi-layer, and I would like to add an
external force to, for example, one layer of the bilayer.  Do I add
an external force by specifying groups and the acceleration on those
groups in the mdp file?  Is there another way to do this?  Do I need
to alter any other files?

Thanks,
Mike