I think what he/she means is a little application that intercepts shutdown messages from windows messenging que and does another operation. For example if your using windows XP on flash media windows will freeze when you shutdown the PC (it's a known bug) You can use a redirector to shut the machine off w/o freezing. Search these threads its here..
Progress [I will seriously never be done!]
Via EPIA MII
OEM GPS (embedded)
nLite WinXP pro on
1GB Extreme III CF card
Carnetix 1260 startup/ DC-DC regulator
Software: Still, re-Writing my existing front end in .Net