You can get this and more information by typing "man snmpd.conf" on the ESX console:

trapcommunity STRING
This defines the default community string to be used when send-
ing traps. Note that this command must be used prior to any of
the following three commands that are intended use this commu-
nity string.

trapsink HOST [COMMUNITY PORT]

trap2sink HOST [COMMUNITY PORT]

informsink HOST [COMMUNITY PORT]
These commands define the hosts to receive traps (and/or inform
notifications). The daemon sends a Cold Start trap when it
starts up. If enabled, it also sends traps on authentication
failures. Multiple trapsink, trap2sink and informsink lines may
be specified to specify multiple destinations. Use trap2sink to
send SNMPv2 traps and informsink to send inform notifications.
If COMMUNITY is not specified, the string from a preceding trap-
community directive will be used. If PORT is not specified, the
well known SNMP trap port (162) will be used.

Hope that helps. You can use it, but you mustn't.