Handling the registry is a piece of cake. Most people are scared of it because of the 
horror stories that used to about with Windows 95/98/ME users accidentally changing 
some settings and having to reformat their hard drives. No need to be scared. Just
remember the golden rule - let sleeping dogs lie. 

This simple example demonstrates how to 
1. Initialise a registry
2. Check for data. In this instance, the data is displayed in TForm1's Caption bar.
3. Change the data. In this instanve, it's read from a TEdit componant on TForm1.

Lots more data and subkeys can be used. It really is this simple!

void StartData(void)
{
TRegistry& regkey = *new TRegistry();
if(!regkey.KeyExists("Software\\" + Application->Title))
    {
    regkey.OpenKey("Software\\" + Application->Title, true);
    regkey.WriteString("User Data", "");
    delete &regkey;
    }
}

void CheckData(void)
{
String UserData = "";
TRegistry& regkey = *new TRegistry();
bool keygood = regkey.OpenKey("Software\\" + Application->Title, true);
if(keygood)
    {
    UserData = regkey.ReadString("User Data");
    }
delete &regkey;
Form1->Caption = UserData;  // This displays the stored data in the form's caption bar
}

void ChangeData(void)
{
TRegistry& regkey = *new TRegistry();
if(regkey.KeyExists("Software\\" + Application->Title))
    {
    regkey.OpenKey("Software\\" + Application->Title, true);
    regkey.WriteString("User Data", Form1->Edit2->Text);
    delete &regkey;
    }
}