A method of effecting an incentive transaction involves a computer server receiving a notification message that identifies a financial transaction. The techniques include receiving or intercepting calls from applications to prompting routines. Output of one FIR filter is subjected to reverberation adding processing by the reverberation adding circuits and then output of yet another FIR filter is added to the above output to obtain an output signal. Next, the collaborative-search system sends a notification to the first user that identifies the group of users that sent search requests that were similar to the first search request. In one embodiment, the silicide contact is smaller in area dimension than an area dimension of said dual workfunction gate conductor layer.