afaik: those mainframe type screens do have different fields embedded, only you can move with the cursor keys inside each field and between the fields. if it's one text widget, you can type over or insert text right over your username/password labels or delete them entirely. so if a user makes the mistake of typing over the labels username/password, how are they supposed to know where the input area for those is?

In reply to Re^3: Tk marks and placing the cursor by aquarium
in thread Tk marks and placing the cursor by Scarborough

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