Arduino sms sender with gsm shield

Hello guys . 

I need a advice about my project idea for graduation project . I want to watch 5 contact like relay and when they change their positions my system send me notification sms . My main problem's sending sms to 10 different recipient and this  recipients are easily removed or replace the new ones by using some kind of windows application . So i must create windows application for programing and sending my phone numbers and messages to my arduino . I need help about the windows application .  Thank u for helping