The last line of Figure 2.4 names three Web browsers as examples of interpreters. Explain how a Web browser is an interpreter by identifying its instruction reference, its repertoire, and its environment reference.

Data From Figure 2.4

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Interpreter Instruction reference 1234569 Retrieve next instruction Interpret retrieved instruction Environment reference Instruction repertoire Interrupt signal? Yes No Change instruction and environment reference procedure INTERPRET() do forever instruction READ (instruction_reference) perform instruction in the context of environment_reference if interrupt_signal = TRUE then instruction_reference entry point of INTERRUPT_HANDLER environment_reference environment ref of INTERRUPT_HANDLER Memory Instructions Data