ARTCC CTLR 'A' FAILED TO FOLLOW LOA WHEN DSNDING A SUPER MD80 FOR ARR; OR MAKE APPROPRIATE HDOF TO CTLR 'B;' RESULTING IN CTLR B CALLING THE MD80 IN THE BLIND AND GIVING A HDG CHANGE TO AVOID A LEAR JET.

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WITH LATE NIGHT OPS IN PLACE; ACR X HAD BEEN CLRED DIRECT DFW ARPT. WHEN CTLR 'A' ASSUMED CTL OF ACR X; HE RECLRED ACR X OVER CQY (CEDAR CREEK VORTAC) WHICH IS A CORNER POST USED FOR NORMAL DAY OPS. THIS NEW ROUTING WAS ENTERED IN THE COMPUTER AND STRIPS PRINTED AT CTLR B'S SECTOR. KNOWING THIS ROUTING WAS NOT IN ACCORDANCE WITH PROCS DICTATED BY AN LOA; WHICH WAS EFFECTIVE AT THAT TIME; AND CTLR 'B' HAVING ALREADY INFORMED CTLR 'A' OF THE PROPER ROUTING; AND THE LATE NIGHT OPS WERE IN EFFECT; CTLR 'B' EXPECTED ACR X TO BE RECLRED DIRECT DFW ARPT. CTLR 'A' DID NOT RECLR ACR X BACK DIRECT DFW ARPT AS HE SHOULD BUT; INSTEAD INITIATED A HDOF TO CTLR 'B.' SHORTLY AFTER HDOF INITIATION; THE CONFLICT ALERT ACTIVATED BTWN ACR X AND CPR Y. CTLR B EXPECTED THE REQUIRED COORD CALL FROM CTLR 'A' BECAUSE ACR X WAS NOT PROCEEDING DIRECT DFW ARPT IN ACCORDANCE WITH LOA PROCS. ACR X'S PRESENT COURSE PLACED HIM IN CONFLICT WITH CPR Y. ACR X ENTERED CTLR B'S AIRSPACE WITHOUT PROPER COORD AND WITHOUT A HDOF AND IN CONFLICT WITH ANOTHER ACFT. CTLR 'B' TURNED ACR X AND MADE A CALL IN THE BLIND FOR ACR X. ACR X RESPONDED TO THE IN-THE-BLIND CALL AND WAS ASSIGNED AN ALT WHICH ENSURED VERT SEPARATION. (NO LOSS OF SEPARATION OCCURRED.) CHAIN OF EVENTS: CTLR 'A' REFUSED TO ACKNOWLEDGE AND COMPLY WITH LATE NIGHT OP PROCS EVEN AFTER CTLR 'B' HAD PREVIOUSLY INFORMED HIM THAT THE LOA WAS IN EFFECT AND WHAT ROUTING CTLR 'A' SHOULD USE. CTLR 'A' FAILED TO COORDINATE A ROUTING WITH CTLR 'B' WHICH WAS DIFFERENT FROM THAT WHICH ACR X SHOULD HAVE BEEN CLRED. CTLR 'A' FAILED TO CONTAIN ACR X WITHIN HIS AIRSPACE UNTIL A HDOF HAD BEEN ACCEPTED. CTLR 'A' SWITCHED TO CTLR 'B' FREQ PREMATURELY.