This system module handles the system notifications.

The maximum number of notifications that can be stored/handled is 100, hence the intended range for notificationIDs is 0-99.

News service "news:u"

Command Header	Description
0x000100C8	AddNotification

This service only has one command.

News service "news:s"

Command Header	Description
0x000100C6	AddNotification
0x0002....	Stubbed, only returns 0.
0x0003....	Stubbed, only returns 0.
0x00040000	?
0x00050000	GetTotalNotifications
0x00060042	SetNewsDBHeader
0x00070082	SetNotificationHeader
0x00080082	SetNotificationMessage
0x00090082	SetNotificationImage
0x000A0042	GetNewsDBHeader
0x000B0082	GetNotificationHeader
0x000C0082	GetNotificationMessage
0x000D0082	GetNotificationImage
0x000E0040	SetInfoLEDPattern
0x000F0000	SpotPass notifications related?
0x00100040	(u8 flag) ?
0x00110000	This writes the input u8 to a state field.
0x00120082	GetNotificationHeaderOther
0x00130000	WriteNewsDBSavedata
0x00140000	This writes an unknown u32 value to cmdreply[2].

"news.db": This is the main save-file, the filesize is fixed to 0x2BD0-bytes.
"newsXXX.txt" This is the message data for this notification, where XXX is the decimal notification-index in the below headers-array. The filesize should be <= <size listed here>, since that's the max size read by the notifications applet.
"newsXXX.mpo" This is the MPO data for this notification if any, where XXX is the decimal notification-index in the below headers-array. The filesize should be <= <size listed here>, since that's the max size read by the notifications applet.

Offset	Size	Description
0x0	0x10	Header, see below.
0x10	0x2BC0 (100 * 0x70)	Array of headers for each notification.

Offset	Size	Description
0x0	0x1	Must be 0x1.
0x1	0x1	Flags: bit0 is set by news-module when handling the AddNotification commands. This indicates that there's "unread" notifications, the notifications applet clears this once all notifications have been "read".
0x2	0xE	Normally zero?

Error code	Description
0xC8A12805	The notification header data for the specified notificationID is not set(the specified notification doesn't exist).