The invention comprises a Security Program (SP), a Simultaneous Approval Program (SAP), an Access Approval Program (AAP), and a Security Table (ST). A user's ability to access low security and high security applications depends on the user's security clearance, which is recorded in the ST. The SP limits a user's access to the applications. When a plurality of authorized users have logged in, the SP runs the SAP and AAP as required to allow the users to access and modify the high security applications. The SAP allows a user to modify the high security application only when a specified number of users approve the modification. The AAP allows a user to access a high security application only upon another user's approval. The SP terminates the users' access to the high security applications if one of the users logs out.