No specific info about version 2.1. Please visit the main page of Logitech 摄像头设置 on Software Informer.
Customize your Logitech gaming device with this free software.
Change function key shortcuts and customize mouse buttons.
Is an application that turns your iPhone or iPod touch into a wireless trackpad.
Windows XP device drivers for Logitech USB based mice.
The Logitech Onscreen Keyboard is a virtual keyboard.
Automatically updates your drivers for Logitech devices.