Controls whether the defined system variable list is monitored.
| Type: | Integer |
| Saved in: | User-settings |
| Initial value: | 1 |
| 0 | System variables are not monitored. |
| 1 | System variables are monitored. Notifications on system variable value modifications are displayed on the command line and status bar. |
| 2 | System variables are monitored. Notifications on system variable value modifications are displayed on the command line and status bar. Balloon notifications are also displayed. |