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Say you have two missile silos, one within striking range of the enemy capital. The other is out of range.
Hold your pointer (ooh sir!) over the enemy capital and hit X to switch to a silo. If it brings up the in-range silo, you can launch the missile to hit the city. Then without moving the pointer, hit X again. The next silo will be able to launch a missile no matter what the range is, as long as you don't move the pointer.
If you move the pointer, the "missile" icon becomes a "missile cross-through" icon instead, and the computer won't let you launch the missile.
Hold your pointer (ooh sir!) over the enemy capital and hit X to switch to a silo. If it brings up the in-range silo, you can launch the missile to hit the city. Then without moving the pointer, hit X again. The next silo will be able to launch a missile no matter what the range is, as long as you don't move the pointer.
If you move the pointer, the "missile" icon becomes a "missile cross-through" icon instead, and the computer won't let you launch the missile.