This article is from the Windows NT Internet FAQ, by firstname.lastname@example.org (Steve Scoggins) with numerous contributions by others.
A.) Use File Manager or Net Use commands to access NetBIOS-based shared
Yes, if the remote user is using NT Workstation V3.5 or WFWG V3.1 RAS.
No, if the remote user is using most third party PPP implementations
such as Chameleon TCP/IP, Spry Air Series 3.0, and Trumpet SLIP/PPP
Winsock. Most of the third party TCP/IP software packages do not
support NETBIOS SMB over a remote slip/ppp connection.
B.) Use a POP mail client to connect to a POP server?
Yes, if the remote user is using NT Workstation V3.5 and RAS PPP
with the TCP/IP option enabled on both ends of the RAS link.
Eudora email works great with NT V3.5 for SMTP and POP3
No, if the remote user is using WFWG V3.1 RAS. The WFWG RAS does
not support PPP and TCP/IP. WFWG V3.1 RAS supports NETBEUI only.