How to use mouse over function to click on a particular textbox

Hi,

I want to use mouse over function to click on a text box on any open windows application

Please help

What?! Could you explain that a bit more.

ACtually i need to make software which picks up data from one column of spreadsheet and paste it in textbox on windows application

You can use the SendMessage api and the "wm_settext" action. But you first need to get the hWnd of the text box that you wish to send the text to. You can do that too with the FindWindow API.