When is APD Invoked?

The Automatic Printer Definition process is invoked whenever:

An attempt to create a file for a destination not defined to CA Spool is encountered.
In effect, an "attempt to create a file" is made whenever a user application or a CA Spool internal component issues ESFOPEN.
Files for destinations not defined in ESFPARM are found during a CA Spool WARM start.
Files for destinations not defined in ESFPARM are found during a CA Spool REINIT.
A member of an (E/)MAS configuration detects that a file for an unknown destination has been created by another member of the (E/)MAS configuration.
A route file (RFnnnn) command issued to alter the destinations for an existing file finds an undefined destination.