Delphi 2.0 and NT 3.51 netapi32 calls

Whilst we have been having some success using Delphi 2.0's registry
object to access the Windows NT 3.51 registry, we have not been able to
succesfully access any of the functions provided by the netapi32.dll
used by NT to provide network functions.

Is anyone aware of a similar Delphi object which can be used to make
network calls?

Probably more likely, can anyone provide a source of examples which use
direct calls to the api from within Delphi?

Thanks for any help you can provide.