asterisk users - Jul 2006 - question about function realtime

Hi,
  I am using realtime function to query the table.

Table sipprop
name,number,forward
Peter,1234,0
May,4321,1

RealTime(sipprop|name|Peter) and it can simple get the output of
number if the record exist.

If I issue RealTime(sipprop|name|John), asterisk will show "No
Realtime Matches Found".  What is the value for NoOp($number) &
NoOp($forward)?