hello
what happens if receiving wallet is disconnected and stays like that for some time. (lets say for 1 month)
does the sent BTCs bounce or be lost?
are they automatically received once receiving wallet is brought back online. (I mean bitclient with that particular wallet is connected to internet)
The simple answer:
The receiving wallet doesn't need to be online.
There is no risk of "not getting" coins and they can't bounce.
The only way to "lose" coins is to lose (stolen, deleted, corrupted) the private key in the wallet for the address coins were sent to.
The real answer ... "there is no spoon".
http://www.youtube.com/watch?v=dzm8kTIj_0MYou don't actually receive bitcoins and the sender doesn't actually send them to you. The blockchain is public ledger. Anyone can look up the current "balances" (technically unspent outputs but lets say balances for now) of addresses. When a sender "sends" coins they are simply transferring ownership of the coins in the public ledger. They sign that transfer with their private key. The network verifies that signed transaction and that ensures only the owner of the private key could have made this ownership change. The record is then updated.
At any point in time your client knows how many coins you "own" by looking at the current balance in the blockchain for each of your addresses. The coins never "move". They never need to get sent to you.
So you could extract the private keys from your wallet, write them down on a piece of paper, die, and 20 years from now someone find the paper import it into whatever wallet currently exists and gain control of those coins.