The predefined identifiers in Pegasus Pascal are:

ABS             ARCCOS          ARCSIN          ARCTAN          ARCTAN2
BOOLEAN         BYTE            CHR             CHAR            CLOSE
CNVDS           CNVIS           CNVRS           CNVSD           CNVSI
CNVSL           CNVSR           COMMANDLINE     CONCAT          COPY
COS             DEC             DELETE          DISPOSE         DOUBLE
ENDDESK         ENDGRAPH        EOF             EOLN            ERROROUTPUT
EXP             FALSE           GET             HALT            INC
INPUT           INSERT          INTEGER         LENGTH          LN
LONGINT         MAXINT          MAXINT4         MEMBER          NEW
NIL             ODD             OPEN            ORD             ORD4    OUTPUT
PACK            PAGE            POINTER         POS             PRED
PUT             RANDOM          RANDOMDOUBLE    RANDOMINTEGER RANDOMLONGINT
READ            READLN          REAL            RESET           REWRITE
ROUND           ROUND4          SEED            SEEK            SELF
SHELLID         SIN             SIZEOF          SQR             SQRT
STARTDESK       STARTGRAPH      SUCC            SYSTEMERROR     TAN
TOOLERROR       TRUE            TRUNC           TRUNC4          UNPACK
USERID          WRITE           WRITELN

SEE ALSO: PP