How to view current connections to an Oracle database?

Howdy all.
Can/Will anybody tell me how to view the current connections to an Oracle database? I would like to be able to see what connections are happening, what username the connection is under, what the hostname is (the machine the connection is coming from), and also what SQL or PL/SQL is currenlty being executed (if any).
wally

select username,osuser,sql_address,sql_hash_value,logon_time,machine,terminal,program from v$session;
  1  select sql_text,piece from v$sqltext sq, v$session se
  2  where sq.hash_value = se.sql_hash_value
  3  and sq.address = se.sql_address
  4  and se.username = 'SCOTT'
  5* order by piece
SQL> /
SQL_TEXT                                                              PIECE
select dummy from dual                                                    0

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