# Reference

Message parts, status and error codes, add-in messages and terms.

Look-up pages for when something needs explaining: why a message took more than one part, what a status code means, or what a message in the add-in is telling you.

## Pages in this section

- [Glossary](https://excelsend.com/docs/reference/glossary/): Short definitions of the terms used in ExcelSend and these docs.
- [Messages in the add-in](https://excelsend.com/docs/reference/add-in-messages/): What each alert and status message in the ExcelSend pane means, and what to do about it.
- [SMS message parts](https://excelsend.com/docs/reference/sms-message-parts/): Why long messages and special characters are sent, and charged, as several parts.
- [Status and error codes](https://excelsend.com/docs/reference/sms-status-codes/): What job statuses, message statuses and 9000-series error codes mean.

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Source: https://excelsend.com/docs/reference/