IBM 3164 ASCII Manual page 49

Chapter 3. Keys and messages
Tab .... key
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Tab (back tab) key
Moves the cursor to the first character of the next tab position
If you press this key in an unformatted page, the cursor moves to the next tab
stop position.
If the Line Wrap option is off, tab stops are always set at the first and the last
character positions of each line in the viewport. Pressing this key after the
cursor reaches the end of the current line causes the cursor to wrap to the first
character position of the same line.
If the Line Wrap option is on, pressing this key after the last tab stop of the
current line causes the cursor to wrap to the first tab stop of the next lower
line. If the Line Wrap option is on and no column tab stops are specified, the
tab-stop position is at the top of the page.
If the scroll function is enabled in the unformatted page, scrolling-up occurs
after the cursor passes the last tab-stop position of the page.
If you press this key in a formatted page when the Tab/Back Tab Key option
is on, the tab operation is the same as the unformatted page. If this option is
off, the cursor moves to the first character position of the next unprotected
field. All column tab stops are ignored. If a page has no unprotected fields,
the cursor goes to the top of the page.
Note:
The Tab .... key works as the
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Tab (Back Tab) key while the Shift
key is held down.
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Moves the cursor back to the previous tab position
If you press this key in an unformatted page, the cursor moves one tab
position to the left. If the Line Wrap option is off, the tab stops are always set
at the first and the last character positions of each line in a page. Pressing
this key after the cursor reaches the first character position of the current line
causes the cursor to wrap to the end of the same line. If the Line Wrap option
is on, pressing this key after the first tab-stop of the current line causes the
cursor to wrap to the last tab stop of the upper line. If the Line Wrap option
is on and no column tab stops are specified, the tab stop position is at the first
position of the page.
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