Bidirectional PIPE, and do not wait for child to terminate

[seany via Digitalmars-d-learn]

I read the manual here: 
http://dlang.org/phobos/std_process.html#.spawnProcess

However, I need to (I can not remember, nor can I find in the 
forums any info thereon) create

1. Bidirectional Pipes - I would like to write something to a 
second program (UNIX, resp GNU/LINUX environment) and listen to 
what it has to say.

2. I would like to continue with my program when the child 
process has spawned (the child process is guaranteed to 
terminate), unlike wait, and trywait does not seem to guarantee 
that the parent process will continue.

Help? Please.