[gmx-users] what is position restrain?

[sudheer]

hi gmx users,
i have one doubt regarding position restrain,
if we want to do postion restrain in amber we mention the atoms in min.in and eq.in files of vaccum phase and in water phase
but incase of gromacs where we will mention and more over when we will do postion restrain in gromacs.
PR must to be done in gromacs?or we can skip this PR step and go to production step,
can you give me the clear idea please.........
thanks in advance.  
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