You can use the AppEnable method of the 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 MTS.
IIsWebVirtualDir.AppEnable
<%
Dim VDirObj
Set VDirObj = GetObject("IIS://LocalHost/W3SVC/1/ROOT/MyAppVDir")
' Enable the application at this directory
VDirObj.AppEnable
%>
AppCreate, AppDelete, AppDeleteRecursive, AppUnload, AppUnloadRecursive, AppGetStatus, AppDisable, AppDisableRecursive, AppEnableRecursive