From YYpBD's MediaWiki
1 Create a new key called "My Today Item" in HKEY_LOCAL_MACHINE\Software\Microsoft\Today\Items.
2 Under HKEY_LOCAL_MACHINE\Software\Microsoft\Today\Items\My Today Item, add the values listed in the following table.
Value name Type Data Comments
Type DWORD 4 All custom items use a Type of 4.
Enabled DWORD 1 0 or 1; indicates whether the item is displayed on the Today screen. If Enabled=0, the user can cause the Today item to appear by selecting the box in the list of items on the Items tab of the Today applet in Settings.
Options DWORD 1 0 or 1; indicates whether the item has an Options dialog.
DLL String "\Windows\Sample.DLL" The full path and name of the DLL.
[Reg.All]
HKLM,Software\Microsoft\Today\Items\My Today Item,Type,0x00010001,4
HKLM,Software\Microsoft\Today\Items\My Today Item,Enabled,0x00010001,1
HKLM,Software\Microsoft\Today\Items\My Today Item,Options,0x00010001,1
HKLM,Software\Microsoft\Today\Items\My Today Item,DLL,0x00000000,"\Windows\Sample.DLL"
