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A lock cylinder opening system comprising: a lock cylinder body housing with a direction of elongation defining an axial direction for the system, having a first and a second end, and having a first and a second axial bores; a rotatable first cylindrical plug in the first bore, the first plug having

A lock cylinder opening system comprising: a lock cylinder body housing with a direction of elongation defining an axial direction for the system, having a first and a second end, and having a first and a second axial bores; a rotatable first cylindrical plug in the first bore, the first plug having an axially extending key slot from the first end of the lock cylinder; a rotatable second cylindrical plug in the first bore, the second plug extending to the second end; a rotatable opening shaft in the second bore, the opening shaft extending at the first and second ends of the lock cylinder; and a selector unit positioned at the second end, having a mechanical connection with the second plug and receiving the opening shaft, the selector unit adapted to selectively enable and disable rotation of the second plug by rotation of the opening shaft.

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What is claimed is: 1. A lock cylinder opening system comprising: a lock cylinder with a direction of elongation defining an axial direction for the system, having a first and a second end, and having a first and a second axial bore; a rotatable first cylindrical plug in the first bore, the first p

What is claimed is: 1. A lock cylinder opening system comprising: a lock cylinder with a direction of elongation defining an axial direction for the system, having a first and a second end, and having a first and a second axial bore; a rotatable first cylindrical plug in the first bore, the first plug having an axially extending key slot from the first end of the lock cylinder; a rotatable second cylindrical plug in the first bore, the second plug extending to the second end; a rotatable opening shaft in the second bore, the opening shaft extending at the first and second ends of the lock cylinder; and a selector unit positioned at the second end, having a mechanical connection with the second plug and receiving the opening shaft, the selector unit adapted to selectively enable and disable rotation of the second plug by rotation of the opening shaft. 2. The lock cylinder opening system of claim 1, wherein the selector unit is adapted to allow manual rotation of the second plug from the second end of the lock cylinder. 3. The lock cylinder opening system of claim 2, wherein the selector unit includes a control and communications unit; a clutch unit; and a power subassembly. 4. The lock cylinder opening system of claim 3, wherein the control and communications unit is adapted to receive command signals, to transmit telemetry signals, and to control the clutch unit. 5. The lock cylinder system of claim 4, wherein the clutch unit includes a motor. 6. The cylinder lock system of claim 5, wherein the motor is adapted to operate the clutch unit and to mechanically engage and disengage the rotatable shaft and the second plug. 7. The lock cylinder system of claim 6, wherein the control and communications unit is further adapted to sense the status of the motor and of the clutch unit and to include information indicative of system status in the telemetry signals. 8. The lock cylinder system of claim 3, wherein the power subassembly is adapted to provide power to the system, the power subassembly including at least one chosen from a list including: batteries, mains power, and battery and mains power. 9. The lock cylinder opening system of claim 1, wherein a matching key is insertable in the key slot to open and rotate the first plug. 10. The lock cylinder opening system of claim 1, wherein the lock cylinder body housing is retrofittable in place of a conventional lock cylinder. 11. The lock cylinder opening system of claim 10, wherein the selector unit is retrofittable along with the lock cylinder. 12. The lock cylinder opening system of claim 10, wherein the selector unit is retrofittable modularly to the lock cylinder. 13. A method of opening a lock system comprising the steps of: taking a lock cylinder with a direction of elongation defining an axial direction for the system, having a first and a second end, and having a first and a second axial bore; configuring a rotatable first cylindrical plug in the first bore, the first plug having an axially extending key slot from the first end of the lock cylinder; placing a rotatable second cylindrical plug in the first bore, the second plug extending to the second end; configuring a rotatable opening shaft in the second bore, the opening shaft extending at the first and second ends of the lock cylinder; and positioning a selector unit at the second end, having a mechanical connection with the second plug and receiving the opening shaft, the selector unit selectively enabling and disabling rotation of the second plug by rotation of the opening shaft. 14. The method of claim 13, whereby the selector unit allows manual rotation of the second plug from the second end of the lock cylinder. 15. The method of claim 14, wherein the selector unit includes a control and communications unit; a clutch unit; and a power subassembly. 16. The method of claim 15, whereby the control and communications unit receives command signals, transmits telemetry signals and controls the clutch unit. 17. The method of claim 16, wherein the clutch unit includes a motor. 18. The method of claim 17, whereby the motor operates the clutch unit and mechanically engages and disengages the rotatable shaft and the second plug. 19. The method of claim 18, whereby wherein the control and communications unit further senses the status of the motor and of the clutch unit and includes information indicative of system status in the telemetry signals. 20. The method of claim 15, whereby the power subassembly provides power to the system, the power subassembly including at least one chosen from a list including: batteries, mains power, and battery and mains power. 21. The method of claim 13, whereby a matching key is inserted in the key slot to open and rotate the first plug. 22. The method of claim 13, whereby the lock cylinder is retrofitted in place of a conventional lock cylinder. 23. The method of claim 22, whereby the selector unit is retrofitted along with the lock cylinder. 24. The method of claim 22, whereby the selector unit is retrofitted modularly to the lock cylinder.