We are using Oracle 10.2.0.3 on AIX 5.3
We are using DBMS_Monitor via an after logon trigger to do an extended trace of an application's startup process.

In the trace file, there is a reference to a cursor #0 throughout the file. The first line in the file, after the header information is a wait statement for cursor #0, see below for an example. There are never any bind, exec or fetch events associated with the cursor, only wait events.

The vast majority of the waits associated with this cursor are:
SQL*Net Message from client,
SQL*Net Message to client, and
SQL*Net mroe data to client

with a few Direct Path read wait events thrown in for good measure.

Does anyone know what the cursor #0 refers to?
Example:
/oracle/admin/PRPCQA/udump/prpcqa_ora_1433636.trc
Oracle Database 10g Enterprise Edition Release 10.2.0.3.0 - 64bit Production
With the Partitioning, OLAP and Data Mining options
ORACLE_HOME = /oracle/product/10.2
System name: AIX
Node name: qaapega01
Release: 3
Version: 5
Machine: 00C9045D4C00
Instance name: PRPCQA
Redo thread mounted by this instance: 1
Oracle process number: 22
Unix process pid: 1433636, image: oraclePRPCQA@qaapega01

*** SERVICE NAME: (SYS$USERS) 2008-02-06 22:13:26.336
*** SESSION ID: (511.24179) 2008-02-06 22:13:26.336
WAIT #0: nam='SQL*Net message to client' ela= 2 driver id=1413697536 #bytes=1 p3=0 obj#=-1 tim=9766407504290
WAIT #0: nam='SQL*Net message from client' ela= 1891 driver id=1413697536 #bytes=1 p3=0 obj#=-1 tim=9766407509637
=====================
PARSING IN CURSOR #1 len=65 dep=0 uid=59 oct=42 lid=59 tim=9766407509754 hv=742195462 ad='0'
ALTER SESSION SET NLS_LANGUAGE='AMERICAN' NLS_TERRITORY='AMERICA'
END OF STMT
PARSE #1:c=0,e=21,p=0,cr=0,cu=0,mis=0,r=0,dep=0,og=0,tim =9766407509750
EXEC #1:c=0,e=28,p=0,cr=0,cu=0,mis=0,r=0,dep=0,og=0,tim =9766407509892
WAIT #1: nam='SQL*Net message to client' ela= 1 driver id=1413697536 #bytes=1 p3=0 obj#=-1 tim=9766407509941
WAIT #1: nam='SQL*Net message from client' ela= 18510 driver id=1413697536 #bytes=1 p3=0 obj#=-1 tim=9766407528496
WAIT #0: nam='SQL*Net message to client' ela= 1 driver id=1413697536 #bytes=1 p3=0 obj#=-1 tim=9766407528579
WAIT #0: nam='SQL*Net message from client' ela= 6342 driver id=1413697536 #bytes=1 p3=0 obj#=-1 tim=9766407534947
WAIT #0: nam='SQL*Net message to client' ela= 2 driver id=1413697536 #bytes=1 p3=0 obj#=-1 tim=9766407534994
WAIT #0: nam='SQL*Net message from client' ela= 73594 driver id=1413697536 #bytes=1 p3=0 obj#=-1 tim=9766407608617