change of variable name in 21.4

[Baloff]

Hello

I have been trying to find the name of the variable to change file
association with an application. according to the book I am reading
it is called Dired-view-command-alist. but not in emacs 21.4a-1 under 
Debian. does any one know what the name of the variable is.
I tried C-h [a to z] for no avail.

thanks

>  LocalWords:  Dired alist