# Installing the MDGMPORT.SYS driver for Windows NT

The Windows NT 3.5 and 3.51 driver is called MDGMPORT.SYS. It provides an NDIS Miniport interface for Windows NT 3.5 and 3.51. You can install the driver either during or after installation of Windows NT. If you are adding a server to an existing domain of servers, you must install the driver during installation of Advanced Server.

| If you are installing a Madge Ringnode for a non-Plug and Play ISA bus, then, before performing the instructions in this section, make a note of the IRQ number, I/O location, and DMA channel that the Ringnode is configured to use.

- Installing MDGMPORT.SYS during Windows NT installation

- Installing MDGMPORT.SYS after Windows NT installation

- Ringnode mirroring for Windows NT.

Click here for information about making an unattended installation of Windows 95 or Windows NT 4.0 using the Miniport driver.