Calling requestPort () prompts the user to select a device and returns a SerialPort object. In the Extension root directory field, specify the path to the extension's folder — for example, c:\myext. Instructions for half-precision floating-point support. hi Dan! Question about https://hacks. To access the Bookmarks Manager, either click the Library icon on the toolbar and click Bookmarks > Show All Bookmarks, or press Ctrl+Shift+B.