> For the complete documentation index, see [llms.txt](https://doc.sysdevmobile.com/mss-extensibility/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://doc.sysdevmobile.com/mss-extensibility/mss-5.0/mss-extension-functions-mss-kalipso/diary/300-diary-diary-module.md).

# 300 - (Diary) Diary Module

300 - (Diary) Diary Module

| Event   | Extension action set  | Description                                                                                                |
| ------- | --------------------- | ---------------------------------------------------------------------------------------------------------- |
| Before  | EXT\_0300\_1\_Before  | Will be executed before MSS open the Diary module;                                                         |
| Replace | EXT\_0300\_2\_Replace | Will replace MSS Diary module (can be used to validate if normal MSS module opens using outOpenMSSModule); |
| After   | EXT\_0300\_3\_After   | Will be executed after closing the Diary module;                                                           |

*Output Parameters:*

* outOpenMSSModule – Return code: 1 – Open MSS module / 0 – Don’t open MSS module; (*event replace*)