[Tasks]
Name: pintotaskbar; Description: "&Pin to taskbar"; GroupDescription: "Other tasks:"; Flags: unchecked

[Code]
procedure CurStepChanged(CurStep: TSetupStep);
begin
  // if the installation just finished and the user selected our 'pintotaskbar'
  // task, then try to pin the app. to taskbar (there's no error handling shown
  // here because you can't do anything when this attempt fails)
  if (CurStep = ssPostInstall) and IsTaskSelected('pintotaskbar') then
    PinAppTo(ExpandConstant('{app}\MyApp.exe'), pdTaskbar);
end;