IBM 5280 User's Setup Procedures page 55

7. If your device has the Keylock feature, read and do the
following. If not, go to step 8.
a. The keys for the Keylock feature are packaged in the customer
setup envelope. The envelope looks like this:
b. Record the identification number of the keys.
c. Insert a key and turn it to the right. If the key does not turn to
the right, use the other key.
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User's Setup Procedures 49