B1 PLD Information on trigger for printing

I would like to have conditional fields within my Salesorder lay-out depending on the fact whether the document is to be printed, mailed or generated as pdf-file.

Is there any database-field or system-variable that can deliver this information? Is there maybe a system-variable with the PRINTERNAME or LAST BUTTON USED?

Thanks ! Egbert

PS: I am on 8.8.1 and upgrading soon to 9.0