what happens if I use a wrong bitcoin adress to send bitcoins to ? Like i forget one number or letter ?
if the adress exists someone else willg et it clear, but if this is not existing will it not transfer ?
Normal client won't let you send to an address that doesn't conform to the bitcoin standards. Getting a standard one with typos or whatnot isn't probably. If you did, the coins would be gone, no way to get them back. Until someone generates that address that is, they'll have a nice surprise waiting for them.