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The TCP/IP "urgent pointer" from the packet being inspected.
RFC 793 describes this field like this..
Urgent Pointer: 16 bits This field communicates the current value of the urgent pointer as a positive offset from the sequence number in this segment. The urgent pointer points to the sequence number of the octet following the urgent data. This field is only be interpreted in segments with the URG control bit set.
This is a read-only register.
This field is only relevant for TCP/IP packets, and will contain the value 0 for others types.
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