If you want OMGclick to control 2 or more game clients, disable Single Client Mode and enter the number of game clients you will be running.
You can have more game clients running than the value set in the Game Clients field; however, OMGclick will link itself only to the most recently active game clients.
Example: Controlling 2 Game Clients When Running 3
If you have 3 game clients running, but only want OMGclick to control 2 of them, first activate the 2 desired game clients. Configure OMGclick to control 2 game clients, then click Start or Reload. OMGclick will then link to the 2 game clients, leaving the 3rd one free for you to control manually (or automatically with another tool).