If you need to retrieve information at runtime that is not provided by the Print Job Information macros, you can use the $[registry key] syntax to store and retrieve environment settings from the registry at runtime.
Raster Image Printer will perform instant macro expansion of all values in the $[registry key] format. These may be run command parameters, save directories and filenames, and control string values.
Because registry data may change during a print job, you may want to instruct Raster Image Printer to defer macro expansion when using control strings. Use an extra dollar sign for this purpose, that is, use $$[registry key] rather than $[registry key].
The complete path to a valid registry key value must appear in the string. For example: