The launcher and target

S5600T storage is used

The server is connected to the controller of the storage array through a fiber optic switch. After the lun is mapped to the host group in the array, how can the hosts in the host group correspond to the actual server? Regarding this question, I saw that the hosts in the host group correspond to the target ID and port, and then to the physical server. But what if many servers access the storage array through the FC port of the same controller? Doesn't it mean that multiple physical servers correspond to the same host in the host group? Then I found out that there is a starter with different starter numbers for different hosts. So, what is this starter? 

Thanks