Conditional processing allows you to evaluate an expression before an action is run and only run the action if the expression is true. For instance if you want to block very large jobs from being printed you could test to make sure the TotalPages variable is below a certain size.

To do this select the action you want to be conditional and clik on the Conditional button. A dialog will popup where you can enter the condition:

The action will now have a blue question mark to indicate it is conditional and the condition will be displayed under the description.

In this case any documents smaller than 100 pages will be printed, anything greater than or equal to 100 pages will be discarded. The expression is a VBScript expression so can contain any VBScript standard functions and can refer to any PD global variables. To remove conditional processing just click on the Conditional button and delete the expression.