The Collector accepts the following logical names which, if
    defined, passes some item of information to the Collector.

    PCAC$DECW$DISPLAY  If PCAC$DECW$DISPLAY is defined as a valid
                       logical name (but not set as " ") then the
                       DECwindows Motif interface will be used.
                       Otherwise the character cell interface will
                       be used.
    PCA$DECW$DISPLAY   If PCAC$DECW$DISPLAY is not defined as a
                       valid logical name (or set as as " ") and
                       PCA$DECW$DISPLAY is defined as a valid logical
                       name (but not set as " ") then the DECwindows
                       Motif interface will be used. Otherwise the
                       character cell interface will be used.
    DECW$DECW$DISPLAY  If both PCAC$DECW$DISPLAY and PCA$DECW$DISPLAY
                       are not defined as valid logical names (or set
                       as as " ") and DECW$DISPLAY is defined as a
                       valid logical name (but not set as " ") then
                       the DECwindows Motif interface will be used.
                       Otherwise the character cell interface will be
                       used.
    PCA$DATAFILE       Defines the performance data file to be used
                       by the Collector; equivalent to using SET
                       DATAFILE/APPEND
    PCA$RUN_NAME       Defines the name of the current collection
                       run; equivalent to using SET RUN_NAME
    PCA$INHIBIT_MSG    Specifies that informational messages be
                       suppressed
    PCAC$INIT          Defines the Collector initialization file
    PCA$INPUT          Defines the Collector input stream
    PCA$OUTPUT         Defines the Collector output stream

    The Analyzer accepts the following logical names which, if
    defined, determine the Analyzer initialization file, the input
    and output streams, and the number of lines per page of PRINT and
    FILE output:

    PCAA$DECW$DISPLAY  If /INTERFACE was not specified on the PCA
                       command and PCAA$DECW$DISPLAY is defined as a
                       valid logical name (but not set as " ") then
                       the DECwindows Motif interface will be used.
                       Otherwise the character cell interface will be
                       used.
    PCA$DECW$DISPLAY   If /INTERFACE was not specified on the PCA
                       command and PCAA$DECW$DISPLAY is not defined
                       as a valid logical name (or set as as " ") and
                       PCA$DECW$DISPLAY is defined as a valid logical
                       name (but not set as " ") then the DECwindows
                       Motif interface will be used. Otherwise the
                       character cell interface will be used.
    DECW$DECW$DISPLAY  If /INTERFACE was not specified on the
                       PCA command and both PCAA$DECW$DISPLAY
                       and PCA$DECW$DISPLAY are not defined as
                       valid logical names (or set as as " ") and
                       DECW$DISPLAY is defined as a valid logical
                       name (but not set as " ") then the DECwindows
                       Motif interface will be used. Otherwise the
                       character cell interface will be used.
    PCAA$INIT          Defines the Analyzer initialization file
    PCAA$INPUT         Defines the Analyzer input stream
    PCAA$OUTPUT        Defines the Analyzer output stream
    SYS$LP_LINES       Specifies the number of lines per page to be
                       assumed when formatting histograms and tables
                       using the PRINT and FILE commands