There are a number of reserved tags in Web Port.
These are shown in the list below:
| Tag: | Description/Used for: |
| WEBPORT_DEBUG | Used for debug |
| WEBPORT_DISK_PV | Disk usage |
| WEBPORT_DISK_LAL | Low disk space |
| WEBPORT_DISK_AL | Low disk space / Alarm/trend-storage stopped |
| WEBPORT_DATE_PV | System date |
| WEBPORT_TIME_PV | System time |
| WEBPORT_DATETIME_PV | System date and time |
| WEBPORT_TRENDDB_AL | Database connection |