It should first be understood that all VDP (Variable Data Printers) are not all capable of producing the same images at the same speed. That said, most systems are capable of producing sequential numbering, 1 and 2 D bar codes, random numbering, harvest marks and graphics. Speed and resolution of print can and does vary a lot from machine to machine. Again, although most substrates can be printed on including absorbent and non-absorbent materials, not all VDP systems offer the variety of inks to be able to do this. Most systems only print in one color — that being black — but more advanced systems can print in other colors and other specialty inks.