Farallon Communications PB 1400 - Manual (Page 10)

10 Chapter 1
Click the Install button. The Installer places networking software in
your System folder.
Note: The Installer places the EN Driver for the Farallon PB 1400
Ethernet Card in your System file. This driver is an EtherTalk
Alternative driver, and it replaces any existing EtherTalk Alternative
driver. (Because the Macintosh System allows only one EtherTalk
Alternative driver at a time, each new alternate driver that you install
replaces the old one.) In general, this only affects your configuration
if you have been using an external Ethernet adapter, such as a SCSI
adapter, Farallon Mac/PB Adapter, or Ethernet PC Card.
After installation is complete, restart your Macintosh.