The Silicon Jungle by David H. Rothman

4. Once the other person is ready—while you’re still in the =T= mode—hit

=T= again, but this second time your finger is on the Control key while you’re doing so. The screen will ask you the name of the file you want sent. Normally, that file will be on your data disk, the one on drive B. B in that case contains the articles, reports, etc., for which you may lack room on the A disk containing your programs. (But if the document to be sent is on A, substitute that letter for =B= in the rest of the steps.)