There are two primary types of variables for PitStop Pro, "Constants" and "Rule Based". Following is a definition of both.
With PitStop Server, there is also the capability to use Rule Based variables and populate variables from XML or JDF data. This can allow an MIS or Web to Print solution to pass XML or JDF based parameters to PitStop Server adjusting preflights checks to match the current document. This type of dynamic processing is only available in PitStop Server. Also, PitStop Server when used with Enfocus Switch can extend this support even further allowing variables to be extracted from any SQL database source.