novice questions

[Manfred Hansen]

Hello,

I have installed hurd from the freeX magazine.
Thanks to Marcus Brinmann

First question
I can´t find a proc filesystem

Secend question
Gives there a strace command ?

Third
I have mounted the cdrom with
settrans -a /cdrom /hurd/isofs /cdrom
but how can i unmount the cdrom. 
I try settrans /cdrom   but there appears a message "resource are busy" 
And i try settrans -fg /cdrom . I believe the cdrom is unmounted
but i can't open the cdrom drive.

Thanks Manfred