[Eug-lug] sticky group?

[Rob Hudson]

How do I set up a directory so that any new files created in its 
subdirectories maintain the group and group write permissions?

For example:  There's a shared folder on a server and a group of users 
create and edit files in that folder.  We want those new files to be 
editable by all users in the same group.  By default, new files are 
created with the user's default user and group making them non-editable 
by others in the group.

Thanks,
Rob