Press Windows+d to return to the desktop. The multimedia safety training toolbox uses PPT animation to demonstrate the educational content, which is vivid and illustrated. You can play case videos and answer questions with a wireless answering machine. The platform integrates online learning, online examination, mobile phone learning, training management, knowledge management and other functions. In terms of content, it provides a large number of multimedia courseware for safety education and training in high-risk industries. If you want to return to the desktop immediately during training, you can use the shortcut key: Windows+D.