# Language Reference

Special File Command Tags |

Special file command tags (enclosed in square brackets) are used to modify paths and filenames for specific I/O uses in PxPlus. They may include a series of semi-colon separated parameters to be processed at run time. Some of these tags are supported only in specific operating environments.

#### Important Note:
The square brackets enclosing special tags are part of the syntax. Other square brackets in syntax examples indicate that elements are optional.

File Command Tag | Description | Supported Platform
[ADO] | Microsoft SQL Server Interface | Windows only
[DB2] | DB2 Support | Any system
[DDE] | Dynamic Data Exchange | Windows and WindX
[DLL] | Dynamic Link Library | Windows and WindX
[HTTP / HTTPS] | Remote Call to Apache Server | Any system
[LCL] | Access User's Local Machine | Any platform via WindX
[LIB] | Program Library | Windows only
[MYSQL] | Open MySQL Native Database Link | Windows, some UNIX/Linux
[OCI] | Connect to Oracle Server | Windows, some UNIX/Linux
[ODB] | Open Database | Windows and WindX
[RPC] | Remote Process Control | Any system
[TCP] | Transmission Control Protocol | Any system
[WDX] | Direct Action to Client Machine | Any platform via WindX

#### Note:
[WDX] specialty commands can only be used when running under WindX. You can also prefix some (but not all) of the other specialty command tags with a [WDX] tag to direct the action to the WindX client machine instead of the server.
WindX, the PxPlus thin-client graphical user interface screen handler, is used to:
• Give a Windows graphical user interface look to character-based applications.
• Optimize a network's use of both Windows and UNIX by directing tasks to the most appropriate platform.
• Provide remote processing through serial and/or TCP/IP communications.