[SNMP4J] finding CPU/Mem Utilization for system

[tanhr]

hi,every one！

　　my questions are : 

    1.how can i get the MIB file extend? 
      for example,HOST-RESOURCES-MIB (i know that there is a host.mib in system32 dir of windows xp)
      where can i download it? 

    2.can i load the MIBs extend to the agent of devices managed just on manager side?can i do that on the center monitor? 

    3.and i wanna get CPU & memory of the devices ,but the OS may be unix,linux or windows,is the HOST-RESOURCES-MIB enough ?need other MIBs? 

thanks 

regards.




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