Passing Data to Windows in Electron

To send events to particular window you can use webContents.send(EVENT_NAME, ARGS) (see docs). webContents is a property of a window instance:

// main process
storeWindow.webContents.send('store-data', store);

To listen for this event being sent, you need a listener in a window process (renderer):

// renderer process
var ipcRenderer = require('electron').ipcRenderer;
ipcRenderer.on('store-data', function (event,store) {
    console.log(store);
});