Duotones, tritones, and quadtones use spot color inks and multiple passes on a printer. They are expensive to produce because of the separate plates and press washes. Photoshop has a duotone mode. Printing these images on an inkjet printer results in a pseudo-duotone. These can be very lovely images and nearly indistinguishable from a true duo/tri/quadtone.
TLR Photographic Filters for Photoshop Elements is a collection of actions for simulating the effects of a large number of popular photographic filters.
The actions in TLR Photographic Effects for Photoshop Elements include a number of simulated filters from the Cokin Creative Filter System. These include the numbers assigned by Cokin as a convenient reference. Others that are unique to this collection are assigned TLR.