System Name; Username - HP ProCurve 420 Management And Configuration Manual

Command Line Reference
System Management Commands
6-12
Example
HP420(config)#prompt RD2
RD2(config)#

system name

This command specifies or modifies the system name for this device.
Syntax
system name <name>
name - The name of this host. (Maximum length: 32 characters)
Default Setting
Enterprise AP
Command Mode
Global Configuration
Example
HP420(config)#system name HP420 Access Point
HP420(config)#

username

This command configures the user name for management access.
Syntax
username <name>
name - The name of the user.
(Length: 3-16 characters, case sensitive.)
Default Setting
admin
Command Mode
Global Configuration