IBM 3174 Reference Manual page 56

Using Your ASCII Terminal
Using this function when the cursor is positioned in a protected field locks the
keyboard (the go elsewhere status line message (X < * >) is displayed). You can
unlock the keyboard by using the Reset key sequence defined for your terminal and
repositioning the cursor.
Erase EOF (End of Field): If the cursor is positioned in an input field, this function
erases the characters from the cursor to the end of the field. The cursor does not
move.
Using this function when the cursor is positioned in a protected field locks the
keyboard (the go elsewhere status line message (X < * >) is displayed). You can
unlock the keyboard by using the Reset key sequence defined for your terminal and
repositioning the cursor.
Erase Input: This function erases the characters in all input fields and then moves
the cursor to the first input location on the screen. If the screen contains no input
fields, nothing is cleared and the cursor moves to the upper left corner of the
screen. If the screen contains no fields at all. the entire screen is cleared and the
cursor moves to the upper left corner.
Field Mark: Using the Field Mark function causes a semicolon (;) to be displayed
at the current cursor location. The field mark character is used to inform the
application program of the end of a field (in an unformatted screen) or of a subfield
(in a formatted screen).
Using this function when the cursor is located in a protected field locks the
keyboard (the go elsewhere status line message (X < * >) is displayed). You can
unlock the keyboard by using the Reset key sequence defined for your terminal and
repositioning the cursor.
IDENT: The IDENT function is used to assign the printer or the print class to be
used when a local copy function is initiated. See "Printing Screen Images (Local
Copy)" on page 3-21.
You can exit the IDENT function by using the Reset key sequence.
Insert: The Insert function places the keyboard into Insert mode. This mode
allows you to insert a character or characters into the middle of an input field
without changing the characters already displayed in that field. An insert symbol
('^) is displayed in the status line to remind you that Insert mode is active.
The following items apply while the keyboard is in Insert mode:
• If the cursor is located in an input field having a null character in any location
in the field beyond the cursor, entering a character causes the new character
to be entered at the cursor location. All remaining characters within the field
(except for null characters and characters to the right of a null character) are
shifted one position to the right. If the location occupied by the cursor at the
time of the insert operation is a null, no shift occurs.
• After ail null characters at or beyond the cursor location in the field are
overwritten, or if there are no null characters, attempting to enter another
character locks the keyboard (the greater than indicator (X *>) is displayed on
the status line). You can unlock the keyboard by using the Reset key sequence
defined for your terminal and repositioning the cursor.
Chapter 3. Using Your ASCII Terminal 3-11