> For the complete documentation index, see [llms.txt](https://docs.videc.de/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.videc.de/acron-9.3/en/anlagenkonfiguration/prozessanbindung/provider/providerid/variablengruppe/extvar-id/symbole_extvar.md).
# Icons
The first icon (see [Overview](#uebersicht)) relates to service processing for this external variable:
 The external variable is not required for service processing.
 The external variable is recorded but not used for service processing.
 The external variable is recorded and used for service processing.
The middle icon (see [Overview](#uebersicht)) relates to alert generation for this external variable:
 The external variable is not required for alert generation.
 The external variable is recorded and used for alert generation.
The last icon (see [Overview](#uebersicht)) relates to measured value archiving for this external variable:
 The external variable is not required for measured value archiving.
 The external variable is recorded but not used for measured value archiving.
 The external variable is recorded and used for measured value archiving.
---
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