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How to make a choice without press enter

How to make a choice without press enter

(OP)
Hi all, i have a simple question, please read the following code:

CODE

#A simple script that print my name or my surname
proc main {} {
    set choice;
    puts "What do you want to see printed on the screen?";
    puts "";
    puts "a: Pasquale";
    puts "b: Frega";
    puts "";
    ?
    if {$choice=="a"} {
        puts "Pasquale";
    } elif {$choice=="b"} {
        puts "Frega";
    }
}
main;
My question is simple, i want simply to press 'a' or 'b' without press return and then i want to see my name or my surname printed on the screen. What might i write on the place of question mark?
Thanks!

RE: How to make a choice without press enter

(OP)
I use cygwin on windows xp, i have solved by:
[CODDE]#A simple script that print my name or my surname
proc main {} {
    puts "What do you want to see printed on the screen?";
    puts "";
    puts "a: Pasquale";
    puts "b: Frega";
    puts "";
    exec /bin/stty raw <@stdin;
    set choice [read stdin 1];
    exec /bin/stty -raw <@stdin;
    if {$choice=="a"} {
        puts "Pasquale";
    } elseif {$choice=="b"} {
        puts "Frega";
    }
}
main;[/CODE]

However it seems a bit hard in windows native system without cygwin. Moreover some keys (e.g. arrow keys) do not work properly on the control of the behaviour of the  script.
I will make some other tests.
 

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