use the distance command:
PyMOL> distance cAB, chain A, chain B, 6.0
Hope that helps.
Mehdi Talebzadeh Farooji wrote, On 04/19/13 21:49:
> Dear Pymol Users,
> I was wondering if there is a way to show distances between two objects
> (two chains) and filter them; for instance to display distnaces between
> atomes of two interacting protein chains which are less than 6 A.
> Any help would be much appreciated,