I've read and tried various techniques for "focusing" the scope reticle on my scope, but I'm not sure I'm doing it right.

First of all, once it's focused, is it focused for targets at all distances? I thought I had it focused at 100 yds. When I look at a much closer object, I can't focus my eyes on the reticle and the target at the same time. Is the objective of reticle focusing to focus it at one selected distance?

Also, if the reticle is focused at one magnification, is it focused at all magnifications?

The technique I've used is to look at a distance object, bring up the scope, and check if the reticle is clear. If I turn the focus ring (on the ocular) completely counter-clockwise, the reticle gets obviously blurry. As I turn it clockwise, it gets better, but there's a wide range of ocular turns that looks equally focused to me. Is this good enough, or is there some way to get the ideal focus?

Thanks!