You can reinstall Poser Pro on the same machine as many times as you want without needing a new auth number or contacing CL. You can even have it installed on 3 machines simultaneously.

ookami, if you're planning on saving up for Max, be prepared for more limited copy protection devices you have to deal with.

Mocap, if you own Lightwave 6.5 you know about the unlock code they require. This is all CL is doing...and no hardware dongle.