Multiple J-Links at the same PC
It is possible to have multiple J-Links connected to the same PC. For the IP/Ethernet based models (J-Link PRO, Flasher PRO, ...) this is pretty clear, but it is also possible for the USB-only based models.
Connecting to a specific J-Link
A J-Link is identified by its serial number (S/N), so in order to connect to a specific J-Link, the S/N needs to be specified, to avoid the selection dialog to pop up. How the S/N is specified depends on the IDE / environment in which J-Link is used. In the following, the specification for different IDEs / environments is listed: