This application is intended to set channel variables.
You should provide name of variable and its value. And later you can use this channel variable in next applications.
Channel variables are usually named in the upper-case.
Channel variables are self-destroyed after channel hangs up. But it's also possible to preserve the channel variable. For this you should set "global" checkbox. Global means that this variable will be accessible for all channels at any time.
When call is hanged up and channel is destroyed, channel variables are erased.
But you can save them. For this you need to set flag global.
global means, that these variables after setting and changing will be available for any other channel at any time.