The planet at war with Eminiar VII for five centuries, a former colony whose battles are now fought by computer.
Vendikar is the third planet of the same star system as Eminiar VII, and was originally settled by Eminians. The two worlds have been at war for some five hundred years, but they long ago agreed to fight entirely through computer simulation, with each side executing the citizens its computers count as casualties.
In A Taste of Armageddon, Vendikar is never visited, yet its simulated attacks drive the plot. When Kirk destroys Eminiar's war computers, the arrangement collapses, and both worlds face the prospect of real war unless they negotiate peace.