Installation guide

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sid={on|off}
Determines how the socket ID (SID) string in the “sidstring” option is
handled; that is, whether the string specified by the “sidstring” option
is sent at the beginning of each UDP packet.
on
The value of “sidstring” is sent at the beginning of each
UDP packet.
off
The value of “sidstring” is not sent at the beginning of each
UDP packet.
The default is "off."
sidstring=string
The string sent at the beginning of each UDP packet if the “sid”
option is set to on. The maximum length of this string is 32 characters,
including escape sequences for special characters. For more details
on the escape sequences, see "Entering Special Characters in String
Values". The maximum parsed length of this string is 32 characters.
That is, this string must reduce down to a 32-character string when
the escape sequences are processed.