Hi everyone,
I want to build a simple software notification with arduino uno.
The scenario is, when I open microsoft word, the blue led will turn on. when I close the program the led will turn off. Or when I open microsoft power point, the orange led will turn on, and so on.
Is it possible? if yes, what should I do? what library I'll need?
please help.... 
Waiting for your good feedback 
Thank you so much.
Hi, you might be better to ask this question in this section of the forum. Perhaps a moderator will move it for you. The difficult part of your project is what to do on the PC. The Arduino sketch will be the easy part.
If that is all you wish to do, then clearly you do not need an Arduino, as all the "smarts" are in the PC.
You could either use a parallel port to control (through a buffer IC) your LED (or LEDs, at least eight), or use a USB to parallel port adapter, or use one of the really cheap USB to TTL converter modules with its handshake lines (RTS, DTR) to drive the LEDs.
This is indeed, nothing more than a software question, not an Arduino one. 
PaulRB:
Hi, you might be better to ask this question in this section of the forum. Perhaps a moderator will move it for you. The difficult part of your project is what to do on the PC. The Arduino sketch will be the easy part.
Hi, thanks for the information.
I already moved my question to interface forum. But I don't know how to delete this one?
any suggest?