1. A computer system including software to execute a dynamic program in a structured environment, the software comprising: a virtual machine software file that implements a first virtual machine to execute a first program, wherein the first program is in a non-dynamic programming language, wherein the first virtual machine manages a first stack, and wherein the first program uses the first stack; and a secured bridges software file that defines a plurality of allowed interaction pathways between the first program and a second program, wherein the second program is in a dynamic programming language, wherein the first program implements a second virtual machine within the first virtual machine to execute the second program using the plurality of allowed interaction pathways, wherein the first program manages a second stack in the second virtual machine, and wherein the second program uses the second stack.