NEC MH4500 - Manual (Page 150)

C-4 Emergency Management Port
Console in Redirect State
The above figure shows the EMP window in redirect state with the terminal
window. The text that appears on the server monitor displays in the redirect
window.
Availability of the various EMP features is determined by two things: the EMP
access mode selected during configuration in the System Management Submenu
of the BIOS Server Menu, and if the server's COM 2 port is configured for
console redirect in BIOS. The three EMP access modes are disabled, pre-boot,
and always active.
EMP Access Modes (Server Configured for Console Redirect)
Mode Server Powered Off During POST After OS boots
Disabled Redirect window appears, but is
blank Redirect window Redirect window
Pre-boot EMP commands available Redirect window* Inactive redirect window
Always
Active EMP commands available Redirect window* EMP commands
available
*The operation mode can be modified by selections in the post reset and post-power-up dialogs. These are server control
dialogs available with the EMP.