Call functions in ABAP : CALL 'ThSysInfo'

hi
i am in need of certain information abt the blow code\
i just wanted to knw where the value HWID gets populated from after executing the below code
can any body help plzzz
CALL 'ThSysInfo'
     ID 'OPCODE'   FIELD OPCODE_MSGSERVER
     ID 'MSOPCODE' FIELD MS_GET_HWID
     ID 'HW_ID'    FIELD HWID
     ID 'ERRMSG'   FIELD ERRMSG.
just want to how the value HWID gets populated in this script
kindly help
its Urgent
<b><REMOVED BY MODERATOR></b>
regards
shoeb
Message was edited by:
        Alvaro Tejada Galindo

pllz help me what is the solution for these
ThSysInfo - How to change the parameters???
CALL 'ThSysInfo'
      ID 'OPCODE'        FIELD OPCODE_GET_VIRT_HOSTDATA
      ID 'PROTOCOL'      FIELD PROTOCOL
      ID 'VIRT_IDX'      FIELD VIRT_IDX
      ID 'HOST'          FIELD HOSTNAME
      ID 'PORT'          FIELD PORT.
i want to change the hostname as by default through system it is taking some hostname but i want to change that hostname can u plzz guide me how to change that hostname as i am using these FM in my webdynpro method
pllzz hel me as soon as

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Call functions in ABAP : CALL 'ThSysInfo'

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