procedure INIT; forward;
function ISTARR:boolean ; forward;
function ISTBRR:boolean; forward;
function ISTAOR:boolean ; forward;
function ISTBOR:boolean ; forward;
function ISTAFE:boolean ; forward;
function ISTBFE:boolean; forward;
function ISTATR:boolean ; forward;
function ISTBTR :boolean; forward;
function RCVABT:CHAR ; forward;
function RCVBBT:CHAR ; forward;
procedure SNDABT (BT:CHAR); forward;
procedure SNDBBT (BT:CHAR); forward;
procedure FINIT; forward;

