When loading the netware-drivers in the "autoexec.bat" of your DOS-client, you automatically "attach" to a netware-server. As a result, a new drive-letter is accessible under DOS, usually containing the programs "login.exe" and "slist.exe".
Because you haven't logged in, nothing else of the netware-server will be visible to you. All actions requested from the DOS-client will be done with the following UID and GID on the Linux-side in this case.
To achieve some level of security, the user/group asscociated with the UID and GID should only have _read_ rights on the files visible, nothing else.