For some user interfaces The use of shift codes will cause them serious trouble The reason is...the skills of people who use shift codes have not yet reached this level. Someone may ask... At worst, the screen will be messy... Is there any more seriousness??? If I just say that the picture is messy That's actually not bad... But... the shift code can write an infinite series of addresses... What does that mean??? Let's make a metaphor... You move the mth line to the nth line... No problem... Next... record the moved cursor address... Then... move the m-th row down by k rows... Then move the kth row to the mth row... Have you noticed that we have gone in a big circle... At this time...if the interface is not powerful Something terrible will happen...the window will crash... Sometimes it will also cause a white frame to appear on your Faint 95 By then... I'm really going to faint... :pp So... Before you get familiar with it... try not to use shift codes as signature files...: