The QuickBooks Remote Access Tool, an optional add-on service by Intuit, grants remote access to your QuickBooks Desktop software. After subscribing, you install the tool on the computer where QuickBooks resides. Then, from any internet-connected device, you can log in to a web portal and connect to your QuickBooks Desktop. This provides a remote desktop experience, allowing you to interact with QuickBooks as if you were using the original computer. However, it's important to note that this functionality may be limited compared to directly using QuickBooks Desktop.