Reference Variable Query

[nbaztec]

Consider the following code:

const int con = 100;

int &ref1 = 10;   //Where is this 10 stored?
int &ref2 = con;

ref1 = 20;
ref2 = 90;

cout<<ref1<<con<<ref2;

This outputs: 20 100 90

My only queries are:

a) Where is the hard coded number 10 stored?
b) When ref1 is modified which memory was modified? (10's or ref1 has it's own memory)
c) Why was const variable not modified but somehow it's reference was?

Regards,
Nisheeth Barthwal