Question about Particle Key Number

I have made leg chain shackles for myself and it works just fine...until i take them off and put them back on. THEN when i look at the Key Number for the particle receiving object...the Key Number changes and i have to change the key number everytime in the particle script. Is there a reason its doin that?

Yes, the key will change when you take it off, because it's not the same object. It's a copy of the same object with the same memory state, but it's an entirely new one with a new key. It's kind of annoying, but I'm told it's a side effect of the way sims are designed.

Your best bet for a workaround is to have your emitter script listen on some channel for the key... then the target prim have a script in it with "llWhisper(your_channel_here,llGetKey())" in state_entry. Put llResetScript() in both attach() and on_rez() in both the emitter and target scripts. You can use llListenRemove to get rid of the listen after you've gotten the key from the emitter.