To run tests in parallel using selenium grid you will have to start as many driver instances as many parallel sessions you want. Each driver should started with unique --port and bound-device-name values and connected to grid with --nodeconfig option.

1. Download latest selenium release from https://www.seleniumhq.org/download/
2. Start Selenium grid

start "SeleniumHub" java -jar C:\Downloads\selenium\selenium-server-standalone.jar -role hub

3. Start as many instances of driver as many parallel sessions you want to have (e.g. for 2 parallel sessions we will start 2 drivers):

start Winium.StoreApps.Driver.exe --port=10001 --bound-device-name="Emulator 8.1 WVGA 4 inch 512MB" –-nodeconfig=template.nodeconfig.json --verbose
start Winium.StoreApps.Driver.exe --port=10002 --bound-device-name="Emulator 8.1 WVGA 4 inch" –-nodeconfig=template.nodeconfig.json --verbose

Note that both drivers were started with different --port and --bound-device-name values. --nodeconfig option was used to tell driver to auto register as node on selenium grid. template.nodeconfig.json is provided with driver and is enough to connect driver as a node to a grid running on a localhost with default port of 4444.

• You can list all installed emulators by running Winium.StoreApps.Driver.exe --bound-device-name=?.
• If you want to run grid on different port or if you want to run node and grid on different hosts, then you will have to edit the configuration file.