You can do this using twitter api is relatively simple. Well some one has done one better and went ahead and built an excel sheet using which you can post messages to your twitter account. Interested? Read on

Link deleted because of suspected virus

Here is a tip from Allen Wyatt’s Excel tips site.

Allen was asked if there is a way to selectively load add-ins for specific worksheets. He said there is a way to do this, but it involves the use of macros attached to the Workbook module for the specific worksheets. Follow these general steps:

1. Load the worksheet for which you want a specific add-in loaded.
2. Press Alt+F11 to display the VBA Editor.
3. Double-click on the “This Workbook” object in the Project Explorer. Excel opens a code window for This Workbook.
4. Place the following macros in the code window:

Private Sub Workbook_BeforeClose(Cancel As Boolean)
AddIns("Add-In Name").Installed = False
End Sub

Private Sub Workbook_Open()
AddIns("Add-In Name").Installed = True
End Sub

1. In the code, change the name of the add-ins (“Add-In Name”) to the real name of the add-in you want to use with the worksheet.
2. Close the VBA Editor.
3. Save your worksheet.

I will be using this method to choose which addins I have loaded at any one time. I have up to three loaded at one time which I don’t need all the time. Thanks Allen