Multiple copies of your digital wallet is hard to comprehend

[opsd1]

If your wallet is digital, you can make copies of it.

So if you spend bitcoins from one wallet, how does it affect the copies?

I guess the network just knows somehow and makes the adjustment?

[Gabi]

Easy, the wallet only contain the private keys to spend your coins.  Copying the keys of course does not multiply your coins! Every transaction (so, the one that sent you your coins too) is registered in the blockchain, of wich every node has a copy 

[tiktoc]

Your wallet doesn't actually store any coins.  What is stored is identification numbers (addresses) that allow the wallet program to look in the blockchain to find out what value is associated with those addresses.  All the records of how much value is associated with each address is actually stored in the publicly shared blockchain.

From here https://bitcointalk.org/index.php?topic=115476.msg1245715#msg1245715

That thread might explain it a bit more.

[nobbynobbynoob]

Thanks for the replies. This is a great community.

Yes, it is.

Bitcoin is a great currency/commodity/asset/Internet thing.