Search "baseball bat parent" with 0 - 700 days as your range, Poser as your forum, and Ockham as your user, and you will get a bunch of discussions of the solution. Be warned, my impression is that P7 has screwed up the old parenting code somehow. I just tried Ockham's directions and I crashed P7. I restarted and tried again, and it worked the second time. i have had it not work in the past.

Quick version:

1. Position object and hands for first frame.
2. Turn on IK for both hands. If you don't, you can't parent them.
3. Parent each hand to the object.
4. Move the object to create new frames.

Steps 1 and 2 are interchangeable; you can turn IK on and off as you pose the first frame. The important thing is that IK must be on when you are parenting the hands, or Change Parent will be grayed out.

You can adjust the hands for rotation, grip, and so forth in key frames. Do not turn off IK, no matter how tempted. If you do, the parent relationship is immediately cancelled for the entire animation, and the next time you run it, the movements will be completely different.

I did this as I described it, so I'm pretty confident that it will work.

M