Dell OptiPlex 755 - Manual (Page 5)

When enabled, the ME State Control option lets you disable ME to isolate the ME computer from the main platform while debugging a field malfunction. The
table below illustrates the details of the options.
In fact, the ME is not really disabled with the Disabled option. Instead, it is paused at the very early stage of its booting so the computer has no traffic
originating from the ME on any of its busses, ensuring that an you can debug a computer problem without worrying about any role the ME might have played
in it.
Intel ME Firmware Local Update Qualifier
This option on the ME Platform Configuration menu sets the policy for allowing the MEBx to be updated locally. The default setting is Always Open. The other
settings available are Never Open and Restricted.
To assist with the manufacturing process as well as OEM-specific in-field firmware update processes, ME firmware provides an OEM- configurable capability that
leaves the local firmware update channel always open no matter what value you select for the ME Firmware Local Update option.
The Always Open option allows OEMs to use the ME firmware local update channel to update the ME firmware without going through MEBx every time. If you
select Always Open, the ME FW Local Update option does not appear under the ME configuration menu. The table below illustrates the detail of the options.
ME Platform State Control
Option Description
Enabled Enable the Management Engine on the platform
Disabled Disable the Management Engine on the platform