Menu substitution lets you toggle between displaying browses and inquiries on the menu. You can also use it to switch between customized and non-customized versions of a program. The system administrator can use Menu Substitution Maintenance (22.214.171.124 in EE, 36.20.6 in SE) to specify which programs are substituted for others when you select this option. By default menu substitution is disabled. It can be enabled for individual users in User Maintenance (36.3.1).