Alt Account

I searched about alt accounts, but it's not so clear for me. Somewhere i readed, that this is way to have you inventory in backup. But I created one existing mine alternative account and updated the CC info with the same as the main and nothing. If I can't use my inventory, it's meaningless to have alt.
Can somebody describe the alt account clear for me? Thank you

Ok if you now have an Alt, I'll assume you can only have one of your avatars open one at a time, make him or her a friend by sending a friend request, log in the Alt, accept friendship. Now in theory they will be in your friends list.

Go back to your main account, select the Alt from friends list and open their profile. Now drag inventory items you want your Alt to have on top of the profile, these items will get past to them. You can not share No Copy items, but you can send the original version to your Alt, just that now your main Alt will not have a copy. You can not send No Transfer, so your Alt can not have a copy of every item your Main Account has, unless of course all your items can be transfered.

Open up the Alt Account and accept everything sent.

If you have a powerful computer it is possible to have both accounts online at once, with this method, you can select items from your main account and drag and drop directly onto the avatar of your Alt account.

It's too bad there isn't a way to have offline storage of items you may not want in your active inventory. They coulld stay on your hard drive until you wanted to import them back into the game.

Thank you for explanation.
Maybe LL must decide to do something other - when you are legitimate user and you have premium account, to share one inventory with your alt. In this case Main and Alt will not have right to login together at one time and to use the same things twice in the same time (security reason).
With my main account I buy some expensive items. I must have right to use them with my alt in legit way if I use them with one account in the same time. I don't see logic to buy new shape, new clothes and new items for my alt!

welcome to the frustrating world of alts

edit> frustrating AND expensive!!!

There is, but people dislike the tools because they can often also be used to steal others work.