Many organizations set up individual autologon accounts for each workstation in order to comply with regulations in their industry. Often times when this is done, they will utilize the workstation name as the name of the account that is intended for use with it. The ForceAutoLogonHostnameAsUsername setting allows EMU Administrators to lock EMU clients into only being able to use the device's hostname as the supplied autologon account name when applying autologon settings to a target host.
With this setting set, the username field will autofill with the target hostname, and EMU users will see a mouseover message informing them the setting has been locked by the EMU Server administrator.