Nautilus processes

[Артур Сибагатуллин]

Hi
I've got a question about Nautilus.
Why after starting X there are many Nautilus processes which take a lot of 
memory. For example:
PID USER      PR  NI  VIRT  RES  SHR S %CPU %MEM    TIME+  COMMAND
11710 turich    15   0 37836  21m  20m S  0.0  2.1   0:02.89 nautilus 
--sm-client-id 11c0a80084000111209531400000113030005 --screen 0
11711 tu
11710 turich    15   0 37836  21m  20m S  0.0  2.1   0:02.89 nautilus 
--sm-client-id 11c0a80084000111209531400000113030005 --screen 0
11711 turich    16   0 37836  21m  20m S  0.0  2.1   0:00.00 nautilus 
--sm-client-id 11c0a80084000111209531400000113030005 --screen 0
11712 turich    15   0 37836  21m  20m S  0.0  2.1   0:00.00 nautilus 
--sm-client-id 11c0a80084000111209531400000113030005 --screen 0
11713 turich    16   0 37836  21m  20m S  0.0  2.1   0:00.00 nautilus 
--sm-client-id 11c0a80084000111209531400000113030005 --screen 0
11714 turich    15   0 37836  21m  20m S  0.0  2.1   0:00.00 nautilus 
--sm-client-id 11c0a80084000111209531400000113030005 --screen 0
11715 turich    15   0 37836  21m  20m S  0.0  2.1   0:00.00 nautilus 
--sm-client-id 11c0a80084000111209531400000113030005 --screen 0
11716 turich    19   0 37836  21m  20m S  0.0  2.1   0:00.00 nautilus 
--sm-client-id 11c0a80084000111209531400000113030005 --screen 0
11717 turich    19   0 37836  21m  20m S  0.0  2.1   0:00.00 nautilus 
--sm-client-id 11c0a80084000111209531400000113030005 --screen 0
11718 turich    16   0 37836  21m  20m S  0.0  2.1   0:00.00 nautilus 
--sm-client-id 11c0a80084000111209531400000113030005 --screen 0
11719 turich    16   0 37836  21m  20m S  0.0  2.1   0:00.04 nautilus 
--sm-client-id 11c0a80084000111209531400000113030005 --screen 0
11720 turich    15   0 37836  21m  20m S  0.0  2.1   0:00.00 nautilus 
--sm-client-id 11c0a80084000111209531400000113030005 --screen 0
11721 turich    20   0 37836  21m  20m S  0.0  2.1   0:00.00 nautilus 
--sm-client-id 11c0a80084000111209531400000113030005 --screen 0
11722 turich    18   0 37836  21m  20m S  0.0  2.1   0:00.00 nautilus 
--sm-client-id 11c0a80084000111209531400000113030005 --screen 0
1

What for this processes? Are they all necessary? And if no how to kill them?