Resolution:
Description:
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Operating System (Unix or Windows) where RV(R)D is running is represented by "os" in  _RV.INFO.SYSTEM.HOST.STATUS message:

Subject=_RV.INFO.SYSTEM.HOST.STATUS.0A6502B8, message={ADV_CLASS="INFO" ADV_SOURCE="SYSTEM" ADV_NAME="HOST.STATUS.0A6502B8" hostaddr=10.101.2.184 sn=0 os=1 ver="8.4.1" httpaddr=10.101.2.184 httpport=7580 time=2013-08-14 19:06:07.672852000Z up=180 rli=60 ms=3 bs=534 mr=0 br=0 ps=15 pr=0 rx=0 pm=0 idl=0 odl=0 irrs=0 orrs=0 cc=1 ipport=9900 service="9900" network=""}

Solution:
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RVD
os=1 Unix
os=2 Windows

RVRD
os=129 Unix
os=130 Windows

Platforms
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All

Keywords:
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code  _RV.INFO.SYSTEM.HOST.STATUS

Operating System code in _RV.INFO.SYSTEM.HOST.STATUS message.