IBM 3270 Manual page 146

If you want to try doing this, jump to a
notepad window and type these lines. Then,
work along with the rest of the instructions.
2. Press the WSCtrl key to put your work
station into Control Mode.
This line appears at the bottom of your
screen:
I
WSCTRl
3. Press the Source key (PF13).
The line changes to this:
Position cursor and use CrSel to define the first corner.
WSCTRL COPY SOURC
4. Use the -Cursor keys to move the cursor to the
upper left
corn~r
of the text.
Twinkle, twinkle, little star.
How I wonder what you are.
High above the sky so bright
I wish I could remember the last line.
If your window is not full-size, some of the
text may be hidden by the border of the
window. To see it all, move the cursor
toward the border and the hidden text will
move into view, or press the Enlarge key.
Chapter 10. Copying Text from Window to Window 10-3