Thanks for you reply.
The program, dhclient, doesn't appear on my system, and this
led me to some further investigation.
Here's what I think I have learned.
There are two packages available, dhclient, and dhcpcd. Suse 9.2
Fortunately, suse provides some shell-script front ends,
ifup-dhcp and ifdown-dhcp. These scripts figure out which
package is installed and then issue the proper command, with
the proper arguments for the package installed.
So I run:
Anyway, thank you, David, for pointing me in the right direction.