(page-parallel) start child 0
(page-parallel) start child 1
(page-parallel) start child 2
-(page-parallel) join child 0
-(page-parallel) join child 1
-(page-parallel) join child 2
+(page-parallel) wait for child 0
+(page-parallel) wait for child 1
+(page-parallel) wait for child 2
(page-parallel) end