How does SSMS grab the name of my server?

In the bottom-right hand side of SSMS's main screen and to the left of where it shows my user-name and the name of the database that I'm in, it gives the name of the server that I'm on. This string is the same as what I put in the "Server name" field when connecting to the server when I first open SSMS and is also shown in the Object Explorer. How does SSMS determine this name? I've tried

SELECT 
  HOST_NAME(),
  @@SERVICENAME,
  DB_NAME,
  @@SERVERNAME,
  SERVERPROPERTY('InstanceName'),
  SERVERPROPERTY('MachineName')

but only SERVERPROPERTY('MachineName') returns a substring of what SSMS shows. The rest have nothing at all to do with the string in question.