By default, PageNotify, Pagenotif.exe, is defined in the registry as the application that MSDefault invokes when a pager message arrives. PageNotify has two modes, one to define its notification behavior when a message arrives on the Personal Page address and one to define its notification behavior for all other addresses. The following key and values register Addr1 as the Personal Page address and register Pagenotif.exe as the notification application.
HKEY_LOCAL_MACHINE\Software\Microsoft\WIS\Paging
; PersonalPageAddress is the Address Tag on which pages arrive.
"PersonalPageAddress"="Addr1"
; NotificationApp is the application MSDefault runs when a page arrives.
"NotificationApp"="PageNotif.exe"
You can replace PageNotify with a custom application to notify a user of the arrival of a page. For example, if a pager service features priorities, such as urgent and normal, you might want to create a custom notification application that plays a different sound depending on the message priority. To do this, change the registry key to reference a different notification application. MSDefault executes the notification application with the following command line:
<notificationapp.exe> Message_ObjectID FolderID