masta:EXPLORER.EXE是个什么进程

EXPLORER.EXE是个什么进程.
全是大写的. 用户名是我自己.
内寸消耗是 18,428
是不是有点大来着.?
还有喔.
高手帮我解释解释这些进程是什么意思.前面的是进程. 后面的是用户名
alg.exe LOCAL SERVTCE
TTraveler.exe Owner
VIPTray.exe SYSTEM
svchost.exe SYSTEM
wdfmgr.exe LOCAL SERVICE
symlcsvs.exe SYSTEM
nvsvc32.exe SYSTEM
ccApp.exe Owner
SOUNDMAN.EXE Owner
rundll32.exe Owner
RavStub.exe SYSTEM
spoolsv.exe SYSTEM
ccEvtMgr.exe SYSTEM
ccsetMgr.exe SYSTEM
EXPLORER.EXE Owner
RavMonD.exe SYSTEM
SVCHOST.EXE LOCAL SERVICE
SVCHOST.EXE NETWORE SERVICE
SVCHOST.EXE SYSTEM
CCenter.exe SYSTEM
SVCHOST.EXE NETWORE SERVICE
taskmag.exe Owner
SVCHOST.EXE SYSTEM
LSASS.EXE SYSTEM
SERVICES.EXE SYSTEM
winlogon.exe SYSTEM
csrss.exe SYSTEM
rundll32.exe Owner
msnmsgr.exe Owner
smss.exe. SYSTEM
msnmsgr.exe Owner
ctfmon.exe Owner
RavMon.exe Owner
RavTask.exe Owner
System SYSTEM
System Idle p... SYSTEM

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System Idle p... SYSTEM 这个进程的CPU竟然高达97..汗..
SVCHOST.EXE SYSTEM 这个进程有N多个. 是怎么回事,

请义士们给我详细点解答.
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拜托你们了.!
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