It automates the creation of CustomKeys.txt , a file the game reads to override default shortcuts.
Modern versions are designed to be "chat-free," meaning they automatically suspend hotkey functions when you open the in-game chat box to prevent accidental skill triggers. How to Use Warkey 7.1
The tool is a critical third-party utility for Warcraft III: The Frozen Throne
This allowed players to use the standard spell keys for items, dramatically improving reaction time.