1. A non-transitory computer accessible memory medium that stores program instructions executable by a functional unit to implement: including a replication structure in a graphical program, wherein the including comprises displaying a replication structure icon in the graphical program displayed on a display, wherein the replication structure icon comprises an interior portion, wherein the replication structure specifies replication of any graphical program code inside the interior portion of the replication structure icon: including graphical program code inside the interior portion of the replication structure icon: automatically generating an implementation of the graphical program, including: generating multiple instances of an implementation of the graphical program code within the implementation of the graphical program, wherein said generating is performed in response to including the graphical program code inside the interior portion of the replication structure icon: wherein the multiple instances of an implementation of the graphical program code are executed during execution of the implementation of the graphical program.