Is it possible to register environment variables in Setup Wizard project?

Question

I am creating a Visual Studio 2008 Setup Wizard for my program
http://support.microsoft.com/kb/307353
I see that it is possible to add registry entries, etc.. Is the

Answer 1

Ickydime (see answers above) custom action sample shows how to add an environment variable by expanding the PATH env variable. I'm sharing below how to create a new environment variable using Environment.SetEnvironmentVariable

    string environmentKey = "MY_VAR";
    string pathUrl = "%ProgramFiles%\\...";
    public Installer1()
    {
        InitializeComponent();
    }

    [System.Security.Permissions.SecurityPermission(System.Security.Permissions.SecurityAction.Demand)]
    public override void Install(IDictionary stateSaver)
    {
        base.Install(stateSaver);
    }

    [System.Security.Permissions.SecurityPermission(System.Security.Permissions.SecurityAction.Demand)]
    public override void Commit(IDictionary savedState)
    {
        base.Commit(savedState);
        Environment.SetEnvironmentVariable(environmentKey, pathUrl, EnvironmentVariableTarget.Machine);
    }

    [System.Security.Permissions.SecurityPermission(System.Security.Permissions.SecurityAction.Demand)]
    public override void Rollback(IDictionary savedState)
    {
        base.Rollback(savedState);
    }

    [System.Security.Permissions.SecurityPermission(System.Security.Permissions.SecurityAction.Demand)]
    public override void Uninstall(IDictionary savedState)
    {
        base.Uninstall(savedState);
        Environment.SetEnvironmentVariable(environmentKey, null, EnvironmentVariableTarget.Machine);
    }