I've tried a number of commands and the command prompt doesn't change.. see below:
#> set netlogins rootprompt="1632 Central"
#> set netlogins cmdprompt="1632 Central"
#> set netlogins premessage="1632 Central"
#>
Prompt didn't change
#> set netlogins cmdprompt="1632 Central"
#>
Prompt didn't change