# System Variables

CTL | Control Code: Key to End Input

Numeric System Variable

## Contents

Integer, end input code

## Description

The CTL variable contains a numeric code (integer) that represents a signal of user input from the keyboard or mouse. From the keyboard, this code represents how the user ended the last INPUT statement.

Value | Represents
0 | Enter key (normal)
1 - 4 | F1 to F4 keys
5 | Input terminated due to SIZ= option
6 - 12 | F6 to F12 keys
> 12 | Positive CTL codes (in the range 0 to 32767) represent function keys, as well as user-defined control signals that are to be returned to the application
< 0 | Negative CTL codes are handled internally by PxPlus (see Negative CTL Definitions)