shared folder and parallel execution of applications

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http://www.linuxquestions.org – I am looking for executing applications in the shared folder with virtualbox as a hypervisor. My question is that if during the run time that the gust OS is running one application if another application is added to the shared folder and want to run at the same time how should we write this script? just for more information all of the applications(executed files) have the same name but with a different inputs and in the different directories. For example we have the directory 1 with one executable app and its input and after some times another directory will created with the name of 2 with i (HowTos)