====== Doors ======

A door is a program a caller runs from a menu: a game, a utility, or a link to another service. ProBoard v4 runs four kinds.

^ Kind ^ What it is ^ Page ^
| **Native doors** | 32-bit and 64-bit Windows programs. ProBoard starts them directly and hands them the caller's connection. | [[v4:doors:native|Native Windows doors]] |
| **DOS doors** | 16-bit DOS games and tools, run through **PBLegacy** and DOSBox-X. | [[v4:doors:legacy_dos|DOS doors]] |
| **Door networks** | Plug-ins that connect the caller to a game hosted elsewhere: BBSLink, DoorParty and Skull Crash. They need no door program on your machine. | [[v4:doors:door_networks|Door networks]] |
| **Plug-ins** | Programs written for ProBoard itself (''.P3X'' files). | [[v4:sdk:overview|Plug-ins and the SDK]] |

All doors are started from a **menu item** (see [[v4:menus:overview|Menus and commands]]). Door definitions live in ''DOORS.PRO'', which you edit in **Network > Door Configuration** in PBConfig.

Every node has its own folder, ''NODEDIR\NODE<n>'', where its drop files and scratch files go, so two callers playing the same door at once never share a drop file.