-------- -------- -------- -------- -------- | | ---> | | ---> | | ---> | | ---> | | |FRONT | |PARSER| | OVQP | |DECOMP| | DBU | | | <--- | | <--- | | <--- | | <--- | | -------- -------- -------- -------- -------- PTAB INFO FRONT nothing PARSER overlay id's, decomp id OVQP nothing DECOMP overlay id's DBU ksort pathname