7.3B3 psql talking to a 7.2.3 server?

Is the following supposed to work? 

$ psql -U neteng -h tide netmaster 
ERROR:  parser: parse error at or near "."
Welcome to psql 7.3b3, the PostgreSQL interactive terminal.

Type:  \copyright for distribution terms      \h for help with SQL commands      \? for help on internal slash commands
    \g or terminate with semicolon to execute query      \q to quit
 

netmaster=> select version();                              version                               
---------------------------------------------------------------------PostgreSQL 7.2.1 on i386-portbld-freebsd4.5,
compiledby GCC 2.95.3
 
(1 row)

netmaster=> 


neteng **IS** a superuser on tide.


-- 
Larry Rosenman                     http://www.lerctr.org/~ler
Phone: +1 972-414-9812                 E-Mail: ler@lerctr.org
US Mail: 1905 Steamboat Springs Drive, Garland, TX 75044-6749