02:27:17.875 Client -> Server: 0xBF (NewCommand::Unknown), frequ: 77, len: 0x0B
0000: BF 0B 00 00 15 00 00 09 91 00 02
15 is a subcomand of 0xBF packet
00 00 09 91 is a npc id
and 02 is a popup entry selection
it is very usefull for example the second entry in the popup is a buy and de third is a sell(only on vendors), in bankers the second option is open bank box, in animals the first is a tame(very usefull for taming scripts).
more info of 0xBF packet:
http://www.hartte.de/uopro/index.html.gz
sorry for my poor english.