c#注册表问题

using System;
using Microsoft.Win32;
class ShowRegistry
{
public static int Main(string[] args)
{
RegistryKey user = Registry.CurrentUser;
RegistryKey software = user.OpenSubKey("software");
RegistryKey microsoft = software.OpenSubKey("microsoft");
RegistryKey IE = microsoft.OpenSubKey("Internet Explorer");
RegistryKey url = IE.OpenSubKey("TypedURLs");
long lCount = url.ValueCount;
if(lCount<= 0)
return 1;
string[] urlArray = url.GetValueNames();
Console.WriteLine("yYou have typed in following web sites in IE:");
int i = 1;
foreach(string URL in urlArray)
{
Console.WriteLine("[{0}]{1}",i,url.GetValue(URL));
}
Console.Read();
}

}
我想问的是1.RegistryKey user = Registry.CurrentUser;
RegistryKey software = user.OpenSubKey("software");
("software")是规定的必须

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