How to calculate number of threads running on Windows 2000 terminal?

How to calculate number of threads running on Windows 2000 terminal for the oracle process?
I have installed Oracle 9i DataBase with 6 patch(9.2.0.6.0) on Windows 2000 Terminal.
But,after database is started up, when i check up the sessions in v$session view.
It is showing like for SYSTEM osuser alone, 10 ORACLE.EXE sessions running on this server machine in active state.
Why it is creating 10 ORACLE.EXE sessions for a single Oracle Server.
This is the output of v$session view.
SQL> select terminal,osuser,status,sid,serial#,program from v$session;
TERMINAL OSUSER STATUS SID SERIAL# PROGRAM
IMGDBSVR SYSTEM ACTIVE 1 1 ORACLE.EXE
IMGDBSVR SYSTEM ACTIVE 2 1 ORACLE.EXE
IMGDBSVR SYSTEM ACTIVE 3 1 ORACLE.EXE
IMGDBSVR SYSTEM ACTIVE 4 1 ORACLE.EXE
IMGDBSVR SYSTEM ACTIVE 5 1 ORACLE.EXE
IMGDBSVR SYSTEM ACTIVE 6 1 ORACLE.EXE
IMGDBSVR SYSTEM ACTIVE 7 1 ORACLE.EXE
IMGDBSVR SYSTEM ACTIVE 8 1 ORACLE.EXE
IMGDBSVR SYSTEM ACTIVE 9 1 ORACLE.EXE
IMGDBSVR SYSTEM ACTIVE 10 1 ORACLE.EXE
SUGANTHI_DBA suganthi ACTIVE 11 91 sqlplusw.exe
11 rows selected.
SQL>

This is how i have related these two views:
SQL> select s.terminal,s.osuser,s.status,s.paddr s_paddr,b.paddr p_paddr,s.program
2 from v$session s,gv$bgprocess b
3 where s.paddr=b.paddr;
TERMINAL OSUSER STATUS S_PADDR P_PADDR PROGRAM
IMGDBSVR SYSTEM ACTIVE 33AF2270 33AF2270 ORACLE.EXE
IMGDBSVR SYSTEM ACTIVE 33AF2654 33AF2654 ORACLE.EXE
IMGDBSVR SYSTEM ACTIVE 33AF2A38 33AF2A38 ORACLE.EXE
IMGDBSVR SYSTEM ACTIVE 33AF2E1C 33AF2E1C ORACLE.EXE
IMGDBSVR SYSTEM ACTIVE 33AF3200 33AF3200 ORACLE.EXE
IMGDBSVR SYSTEM ACTIVE 33AF35E4 33AF35E4 ORACLE.EXE
IMGDBSVR SYSTEM ACTIVE 33AF39C8 33AF39C8 ORACLE.EXE
IMGDBSVR SYSTEM ACTIVE 33AF3DAC 33AF3DAC ORACLE.EXE
IMGDBSVR SYSTEM ACTIVE 33AF4958 33AF4958 ORACLE.EXE
IMGDBSVR SYSTEM ACTIVE 33AF4D3C 33AF4D3C ORACLE.EXE
10 rows selected.
SQL>
Here, It shows 10 sessions are running.
Whether this means 10 threads are running on the particular server or not?

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