[erlang-questions] hot-code replacement

[jces@REDACTED]

>can anyone tell me in detail about the hot-code replacement feature in 
>erlang and how it works... Also i am a bit confused if this feature is 
>inherent to erlang or implemented just as a added function..

I'd like to add on to the question: how do data structure changes interact
with code replacement? How can you change the definition of a record in a
module and then cleanly use that, or are code updates just about functions
definitions?