Siebel Startup Option

Basic:
"C:\Program Files\Siebel\8.0\web client\BIN\siebel.exe" /c CFG_FILE_PATH\uagent.cfg

/d specify the datasource
/u specify username
/p specify password
/log
/s specify spool file - to export the SQL statement used.  For troubleshooting and performance tuning purpose
e.g.
C:\sea\client\BIN\siebel.exe /c  "c:\sea\client\bin\serviceprd.cfg" /SERVER /s  "C:\sea\client\TEMP\siebellog.txt" /log