0 - 2 of 2 tags for tdpid

Hello all:
My question is for any utility, but we can use BTEQ as an example.
.LOGON tdpid/username,logon
My understanding is the tdpid optional, however, if I run this from a bteq prompt:
.LOGON username,logon
I get an invalid logon.  

This book provides reference information about BTEQ (Basic Teradata Query), a general-purpose, command-based report and load utility tool. BTEQ provides the ability to submit SQL queries to a Teradata Database in interactive and batch user modes, then produce formatted results.