what is the difference between DBCname in DSN and tdpid (teradata director program) ?

Database

what is the difference between DBCname in DSN and tdpid (teradata director program) ?

while in the odbc.ini file ,i can find the DSN for a database :
Driver=/abc/cdf/tdata.so
Description=
DBCName=teradata_test
Username=
Password=
DefaultDatabase=

while when we logon teradata using .logon

bteq .logon teradata_var/username,passwd, teradata_var is the tdpid .

can someone tell me the exactly difference between the two ?

thanks a lot.
Keith
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