How do I force an FTP user to '/home/ftpdir'?

[Tom Hightower <tomh5480@xxxxxxxxx>]

Customer wants to setup a generic FTP account for their tech support 
folks in the field.  Along with that account, they have an IFS directory 
called '/home/software' which has the software that they need to install 
at various customer sites.

When they login via FTP using that account, the tech folks need to be 
positioned directly in that support directory, and to have access to 
nothing else other than that directory (or its subdirectories).  No 
going to a higher-level directory, no deleting files in that directory 
(or sub-directory), no running of AS400 commands.

The 'no-deletes' and 'no-commands' requirement I can handle with FTP 
exit programs, but how do I handle the directory requirements?

Tom