sentences:  To view PPML documents special software will be needed.For instance, if someone wants to retrieve a document out of a PPML archive, the document will have to be converted to an image by a PPML RIP (just as a PPML printer would) This "as printed" image is shown on screen by the PPML viewer software.Several such viewers exist, including ones from EFI, Hewlett-Packard, Xeikon, and Edmond R&D.