I as many of you am looking around for a comprehensive answer to the decimal issue.
So far from what I read from "the BTC giants" is that BTC will never be split or in any other way be altered, i.e. There will never be any other unit of account (in the network or the blockchain) than BTC, not mBTC or satoshis. 

So, that leads me to the next part of my question; then the unit of account ( to satoshis or whatever) conversion happens at the individual transaction between buyer and seller? And if this is a correct understanding - in order to transact those individuals need what? Is it sufficient with any wallet? I cannot see this option in mine at least....

I have also heard that all wallets are set up to handle mBTC etc.  So does that mean that I as a potential buyer of whatever can "flick" a switch in my wallet and I have all my BTC turned into Satoshis?

Thanks for your input