Looking For A Computer Program?

   There is no chance to have such a program: D But the idea is not bad, there will just be a huge delay until the sound is processed by the computer and the corresponding note corresponding to the corresponding tone is displayed on the screen. By the way, what is such a program for you? There is another one, Guitar Pro 5 (there is also a 6th version), which is for notes and tabs - there are ready-made tabs of songs on the Internet written for this program - you open it, press a button and it does what is written.

   Maybe you want to compose music, but you don't know the musical notation?

   On the contrary, there is, of course, that the idea is great, and has long been realized - Impulse Tracker (http://en.wikipedia.org/wiki/Impulse_Tracker). You need a virtual machine, for example with VmWare with MS-DOS OS, run the program, connect the guitar and watch. The reception of the sound from the computer is not based on a microphone or some other technique that interprets the sound, but directly with a cable from the amplifier on the channel of your sound card. Here is a short demonstration - http://www.youtube.com/watch?v=ecnVkIbeorg

   AP Tuner - used to tune the guitar, but writes any note anywhere on the fretboard. It's free, very good ... I used it to record a melody that I hum with my mouth or guitar if I don't remember right away which tone is playing right now.