Not really related to your question but sort of similar to the macro given above, I use this for my Warlocks:

/assist <toonname>
/stopmacro [mod]
/petattack

This macro lets you assign one button the ability to either send in a pet immeditately OR set a target for a pet without sending it yet. Good when you have multiple locks/hunters and you want to set their targets before a fight. Just select target with main, hold down a modifier key (control, alt, shift, etc) and press your key. Then press CTRL-1 to get the fight started with multiple pets going to different targets. Saves a few keys on your keyboard.

Edit: Oh, you'll need a different key for each of your alts so you can set the targets for each one individually.