KEY1-CORE.html is the global credential manager surface in the Coffee web stack: IndexedDB under coffee-keyvault, plus JSON mirrors for older apps. The page copy states clearly that nothing is sent to Coffee Computer servers from that UI — your secrets stay in your browser profile.
coffee-keys.json beside the page (service name + field hints).
Other pages import ../coffee-key-vault.js or read window.CoffeeKeyVault so one paste in KEY1 feeds the ecosystem — matching the sidebar note on the live page.
Use the 📕 control in the KEY1 header to reopen this Academy track anytime.