This is the MIDI note #60:
http://en.wikipedia.org/wiki/Do_%28musical_note%29[
^].
Besides, you could do the following: 1) take any MIDI library which allows you to send at least basic MIDI messages and write code capable of sending notes of your choice, so you could here them; 2) listen to the note in questioni using some musical instrument with known assignments of octaves and notes; if you don't have any, find some software keyboard; you would be able to find a number of such programs; 3) using your code, select a note which sound at the same pitch.
This recipe does not require
absolute pitch ability, less than average
aural skills which is owned by the absolute majority of population would be more than enough to solve this problem.
And your second question is
redundant; the answer can be inferred from the answer to your first question.
—SA