If you closed your session/browser window by mistake, your changes and calculations are not lost because they are still stored in memory for a certain amount of time:
- 3 minutes by default (memory is automatically flushed from the server to improve overall performance).
- 48 hours if the Keep session alive feature is turned on.
How to retrieve a closed window?
To retrieve closed session information, open the Project manager then click on the Tachometer icon on the top-right corner.

If any session can be restored, a popup window will appear displaying the name of the project available to restore.

Simply click on the blue Retrieve button. It will reopen your project in a new tab of your web browser. Your calculation progress bar will also be restored.