ag</code> - the external format to be compliant with.
            OtpExternal.newRefTag where only a subset of the bits are used (see other constructor)
            OtpExternal.newerRefTag where all bits of ids and creation are used.
            newerPortTag can only be decoded by OTP-19 and newer.</dd>
<dd><code>node</code> - the nodename.</dd>
<dd><code>ids</code> - an array of arbitrary numbers. At most three numbers
            will be read from the array.</dd>
<dd><code>creation</code> - another arbitr