The ActBufferId property identifies the 
ActBuffer Virtual System Table (VST). This VST contains three records that provide data on the activity of the temp-table database buffer cache. The first and second records are identical (total and primary buffer pool). The third record contains data on the alternate buffer pool, which is not available for the temp-table database. You can pass the 
ActBufferId property to the 
GetVSTHandle()method to return the handle to the 
ActBuffer VST. This property is read-only.