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* Emulating self-modifying code, especially when it must be [[reentrancy (computing)|reentrant]] or read-only.<ref name="pdp11x"/>
* In the IBM System/360, the ''execute'' instruction can modify bits 8-15 of the target instruction, effectively turning an instruction with a fixed argument (e.g., a length field) into an instruction with a variable argument.
* Privileged-mode ''execute'' instructions are {{clarify|text=used|reason=How can execute instructions reduce privileges or access rights}} by operating systems to execute operations such as block copies within the virtual space of user processes.
==Notes==
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