How do I save/request data hostside

I want to create a game, where data is saved and requested hostside.

E.g. If i pick up a coin as peer the information will be sent to host. There it is saved (to file) (sth like coin=coin+1)

Now if the peer (e.g.) opens the inventory the amount of coins shall be requested from the host.

Is that possible ?

Also, it hasn't to be hostside...

it could also save that information on some file on a website - some datas like : position, inventory items,... - so that the player can't edit them himself, but the game will request it anytime it starts from a distance location.

I would also be interested into how i'm able to create and save accounts within a multiplayer session.

I don't care if a SQL database will be required.

If so... i would need to know how i'm able to access my sql database using construct, and manipulate it's databases.

I surfed a bit through the forums and found out that this could be possible by creating arrays and sending them with the proper command to an sql database. Not quite sure though.