Library /sys$common/syshlp/pca$help.hlb SET, TERMINAL, Description  *Conan The Librarian (sorry for the slow response - running on an old VAX)

    The SET TERMINAL command sets the terminal width or page size
    that PCA uses to format output. It does not reset the terminal
    itself, however; you must do that manually. If you are in screen
    mode, the screen is refreshed.

    The default terminal width and page size are determined by your
    device type or by the last SET TERMINAL command you entered at
    DCL level.