You can use the AppEnable method of the IIsWebDirectory or IIsWebVirtualDir object to reinstate a Web application definition that was previously disabled with the AppDisable method. If the application specified was not previously deleted, it will be reregistered with Component Services.
DirObj.AppEnable
<%
Dim DirObj
Set DirObj = GetObject("IIS://LocalHost/W3SVC/1/ROOT/MyAppDir")
'Enable the application at this directory.
DirObj.AppEnable
%>
AppCreate, AppDelete, AppDeleteRecursive, AppUnload, AppUnloadRecursive, AppGetStatus, AppDisable, AppDisableRecursive, AppEnableRecursive, AspAppRestart