I have a NWCALLS.DLL under my old Warp 4 partition, E:\OS2\MDOS\WINOS2\SYSTEM\NWCALLS.DLL with a 1996 file date. I have no memory of it.
Seems to be for Netware. Running strings.exe NWCALLS.DLL outputs this,
VS_VERSION_INFO
StringFileInfo
04091252
CompanyName
Novell, Inc.
FileDescription
NetWare| Calls Library for Microsoft| Windows NT
FileVersion
4.01
InternalName
NWCALLS
LegalCopyright
Copyright
9 1990, 1993 Novell, Inc. All rights reserved.
LegalTrademarks
NetWare and Novell are registered trademarks of Novell, Inc.
OriginalFilename
NWCALLS.DLL
ProductName
NetWare Client API for C 1.0
ProductVersion
1.01
VarFileInfo
Translation
So I guess there is also an OS/2 equivalent.