Limit order books and limits of retail traders

I understand that in forex there is no central order book. But do market makers see the limits that stand at particular level. Especially from retail side? When I put a limit with my broker on mt4, is that limit internally kept on the broker book within the mt4 server and either taken by the broker or matched with other trader liquidity in the same broker or whatever when it gets activated, or does the broker take the limit to the interbank market. To say it the other words, does the market maker observe the aggregate retail limits as "true" limits in some order book anywhere, or are our limits just market orders that are UNKNOWN to the market maker until he activates them as an arriving market order at certain level?

Just to mention as an insurance, I know what is a book b book etc and do not want to drive the thread in that direction. I am asking particularly if true limit order exists from retail perspective and if it is known and observed prior to activation from the providers.

Your broker sees all your limit orders and those of all its customers.

What will happen with that order depends on the broker, the size of the order, the type of account, etc. Just bear in mind that everything can happen if you trade from a retail account.