The new features for the 3.1 version of the network driver interface consist primarily of:
Saved network connections
New capability bits
New return values
String handling
Error message handling
New print, connection, and dialog functions
Default shell behavior
Long filename interface
Enhancements to the MS-Net version 3.1 driver
Drivers written to the Windows 3.0 level of functionality will be supplied with
reasonable defaults for all 3.1 features. If a network does not require special
support for any of the features, the network driver may be written to the 3.0
specification.