| PxPlus System Programs and Files | 
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The links below provide information on the programs used by PxPlus to handle hot keys and built-in Help and Query facilities. Normally, application programs should not call these routines; however, they have been included as part of the Help documentation to provide application designers with a better understanding of how the system internals operate.
| Program/File | Description | 
| File that contains the internal activation information for your version of PxPlus. | |
| Hot-key intercept utility program that is invoked internally by the PxPlus executive whenever a terminal input encounters a CTL value between -1 and -999. | |
| Device drivers. | |
| Intended to serve primarily as a sample error handling program. | |
| Two keyed files that contain the keyboard command sequences and their respective CTL values. | |
| *LEXTBL file contains an internal format image of the syntax tables used by the PxPlus compiler and lister components. *LEXDEF file contains the same information but in a conventional keyed file format to be used by the utility *LEXEDIT. | |
| File that contains all the textual elements of the PxPlus executive, including a list of data validation messages. (Data validation messages 180 through 193 were added in PxPlus 2019.) | |
| Used by the system utility program *UCP to maintain the descriptions and the valid ranges for the system parameters. | |
| 'Standard' query processor that uses the information created by '*QUERY.DEF' to create and display a query. | |
| Utility program called by the Help subsystem to create or modify 'standard' query definitions. | |
| General system start-up program that is always executed during PxPlus initialization or after a START directive. | |
| Used by most terminal device drivers to load the keyboard control sequences for the terminal. | 
The following files have a two- or three-character language code as part of the file name:
*LEXTBL.EN/*LEXDEF.EN
*MLFILE.EN
*PRMDEF.EN
This language code is taken from the system environment variable LANG. If undefined, the value of EN (for English) will be used.