Formula meaning: stock selection exchange software that has not hit a new low of 120 for three consecutive days, and a multi-functional securities information platform. Compared with other market software, it has the advantages of simple interface and faster market update. Communication allows users to divide the screen freely and specify the content corresponding to each block. As for shortcut keys, it is also one of the characteristics of Tongda letter. Another very useful function of Tongda letter is "online popularity", which can let you know which ones are currently concerned, which ones are continuously concerned and which ones are currently unpopular, so that you can more directly understand the attention of each stock.