How to print messages on form through procedure

[mrankurmodi]

Hell Frinds,
As per client requirements i want to Add some messages on Receipt(Localized) Form like e.g'You have completed Process and now you can close the windows'. I want to print this message through one backround procedure i have tried but not able to sucess.Could you please help me how to print message?Please i m waiting for any solutions from you professional guys