The ndir command is a legacy DOS utility that allows you to view file attributes and compression information for all files in a directory.
NDIR is a client-side application, not a server-side application. Install the Novell Client for Windows on your workstation, then use the Novell Map Network Drive option in the client menu to map a local drive letter to the sys:/public directory. Open a DOS Command Prompt window, cd to the mapped drive, then issue the ndir command from the command line.