Rather than IK for the rope, you might want to consider Easy Pose.  Much easier to set up and crosses platforms without a hitch.

Ajax (it's creator) sells EasyPoser Underground at RDNA.

I highly recommend PhilC's All Tied Up plugin for Poser.

You can find it at PhilC.net.

IK in Poser and the half finshed IK in DS do not work in quite the same way.