The Free On-line Dictionary of Computing (30 December 2018):

network redirector
redirector

    An operating system driver that sends data to
   and receives data from a remote device.  A network redirector
   often provides mechanisms to locate, open, read, write, and
   delete files and submit print jobs.

   It also makes available application services such as named
   pipes and mailslots.  When an application needs to send or
   receive data from a remote device, it sends a call to the
   redirector.  The redirector provides the functionality of the
   Application layer and Presentation layer of the OSI
   model.

   In Microsoft Networking, the network redirectors are
   implemented as installable file systems (IFS).

   (1999-08-08)