Having trouble unmounting a file system in Unix

So you are trying to unmount a file system for some reason and it just wont let you. It keeps on telling you that it is busy. Whats the deal. You already cd to / so you are not the culprit. So instead of kicking everyone off the box just figure out who the offender is and yell at them.

Excerpt from /var/adm/messages

6 server05 mount[4691]: [ID 612810 user.error] mount: /www: Device busy
Feb 5 07:41:19 server05 mount[4708]: [ID 612810 user.error] mount: /www: Device busy
Feb 5 07:41:43 server05 mount[4717]: [ID 612810 user.error] mount: /www: Device busy
Feb 5 07:43:30 server05 mount[4949]: [ID 612810 user.error] mount: /www: Device busy
Feb 5 07:49:55 server05 mount[5273]: [ID 612810 user.error] mount: /www: Device busy
Feb 5 07:53:39 server05 mount[5656]: [ID 612810 user.error] mount: /www: Device busy
Feb 5 07:54:31 server05 mount[5713]: [ID 612810 user.error] mount: /www: Device busy

use fuser to identify the process that is causing the trouble.

server05% fuser /www
/www: 4053c

server05% ps -ef | grep 4053
abe 4061 4053 0 07:27:20 pts/3 0:00 less access
abe 4053 4031 0 07:26:50 pts/3 0:00 bash
abe 4075 4053 0 07:28:05 pts/3 0:00 less access
abe 4067 4053 0 07:27:42 pts/3 0:01 less access
abe 4122 4053 0 07:28:44 pts/3 0:00 more
abe 4121 4053 0 07:28:44 pts/3 0:00 grep -i keep-a access
louis 6983 6950 0 08:14:57 pts/1 0:00 grep 4053