# DUPLEX

> [HTML Version](duplex_pd.htm)

**//DUPLEX, mode**

DUPLEX specifies which of the three types of duplexing will be used. The possible values, along with their several aliases, are shown in the following table.

| **Value** | **Aliases** |
|------|------|
| Horizontal | Horz, H, Short, S, 3 |
| Vertical | Vert, V, Long, L, 2 |
| None | Off, False |




DUPLEX is one of the GDI printing directives with a [Printer ini file Equivalent](printerinitfileequivalent.htm.md).