A switch is sort of like a boolean value. It can either be 0 (Off/False) or 1 (On/True)
You can use conditional branches to check if a switch is on, and show a different message depending on what switch is on. You could also achieve this with multiple event pages.
I'm happy to announce that my game, FusionFall Fighters has started the closed beta phase!
Here's a little banner I made for it!
Here's the gamejolt page as well.