According to the IBM APL2 Programming Language Reference (page 423), the )COPY command should not copy ⎕PW. The manual states: "The only system objects that can be copied are ⎕CT, ⎕FC, ⎕IO, ⎕LX, ⎕PP, ⎕PR, and ⎕RL.
Current GNU APL:
)CLEAR
CLEAR WS
⎕PW←80
)save ws1
2014-07-01 20:57:00 (GMT-5)
⎕PW←132
)COPY ws1
SAVED 2014-07-02 -4:57:00 (GMT-5)
⎕PW
80