vˈɜːtʃuːəl tˌiːˈaɪ, ɔːɹ "vˌiːtˌiːˈaɪ," ɪz ɐ fˈiːtʃɚɹˈɪtʃ ɡɹˈæfɪŋ kˈælkjʊlˌeɪɾɚɹ ˈɛmjʊlˌeɪɾɚ fɔːɹ mˈaɪkɹəsˌɑːft wˈɪndoʊz, ɹˈɪʔn̩ ɪn sˈiː plˈʌsplˈʌs baɪ ɹˈʌsti wˈæɡnɚ.
Virtual TI, or "VTI," is a feature-rich graphing calculator emulator for Microsoft Windows, written in C++ by Rusty Wagner.