===== OPEN a DOOR =====
This command allows you to open a DOOR to another application. You may open a door via door number or by name.


==== Subcommands ====

|**[door #]**|This represents the number of the DOOR to open.  It may either be stacked with the command at the conference command prompt (e.g., OPEN;1) or chosen after the DOOR menu is displayed.|
|**[door name]**|Instead of the DOOR number, you may type the actual DOOR name.  For example, to open a door called 'EXCITING' you could type OPEN;EXCITING from the conference command prompt. **NOTE:** If you use the name to open a door then you can type just the name of the door at the conference command prompt.  For example if you have a door called MAIL, type MAIL at the conference command prompt to open the door.|
|**[parameter]**|You may pass a parameter to the DOOR that is called. This parameter is similar to one passed at a DOS prompt to another application.  Not all DOOR programs accept parameters so unless a particular DOOR states that it will accept parameters, assume that it does not.  As an example, if you were to open a door by typing OPEN;SALES;ANYTHING, you would be opening a DOOR called SALES and ANYTHING would be passed as a parameter.  To access the parameters in a DOOR batch file you need to read the PCBDOOR environment variable.  See the Doors section of the Conference Setup chapter in this manual for further details. |


==== Description ====
A DOOR can extend a BBS because a DOOR is more or less an application that is independent of the bulletin board system. For example, a door could be an on-line game or an on-line database.  If you do not specify a door number or name to open, the door menu is displayed so that you may pick a door to open.