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<p>Several dynamic software-based updating systems that are in the research and production stages are described. In particular, the procedure-oriented dynamic updating system (PODUS) is discussed. In PODUS, a program is updated by loading the new version of the program and replacing each old procedure with its corresponding new procedure during execution. Updating a procedure involves changing the binding from its current version to the new version. When all procedures have been replaced by their corresponding new versions, the program update is completed.</p>
software maintenance; on-the-fly program modification; dynamic updating; dynamic software-based updating systems; procedure-oriented dynamic updating system

M. E. Segal and O. Frieder, "On-the-Fly Program Modification: Systems for Dynamic Updating," in IEEE Software, vol. 10, no. , pp. 53-65, 1993.
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