Special variables have a predefined meaning within a computer programming language.



Task

List the special variables used within the language.




Name      Type          Description
---------------------------------------------
TIB      integer    Terminal Input Buffer address
U0       integer    current user area address
>IN      integer    holds offset into TIB, used for parsing
BASE     integer    holds number conversion radix
STATE    integer    holds compiler state (true=compiling, false=interpreting)
DP       integer    holds dictionary memory pointer
'SOURCE  integer[2] contains length and address of input source
LATEST   integer    address of last word added to dictionary
HP       integer    HOLD pointer, used for number formatting routines
LP       integer    leave-stack pointer, used by do loops
S0       integer    end of parameter stack
PAD      chars[80]  Generic buffer. (size is implementation dependent)
L0       integer    bottom of leave stack
R0       integer    end of return stack