>I have an app that runs unattended and generates pdf files from VFp reports. If there is an error in the report, the application stops with an error message, and waits for user input. There is no user around to press a key.
Build the app as out-of-process (exe) COM Server.
Configure the COM server with DCOMCNFG to run as interactive user.
SYS(2335, 0) in Init of your COM server class
Capture errors in the ERROR event of the class

I have already done it and soon will create article about creating PDFs from web server using standard PS printer driver and GhostScript.

Best Regards