## Tcl8.6.15/Tk8.6.15 Documentation > Tk C API, version 8.6.15 > Inactive

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### NAME

Tk_GetUserInactiveTime, Tk_ResetUserInactiveTime — discover user inactivity time

### SYNOPSIS

#include <tk.h>
long
Tk_GetUserInactiveTime(display)
Tk_ResetUserInactiveTime(display)

### ARGUMENTS

Display *display (in)
  The display on which the user inactivity timer is to be queried or reset.

### DESCRIPTION

Tk_GetUserInactiveTime returns the number of milliseconds that have passed since the last user interaction (usually via keyboard or mouse) with the respective display. On systems and displays that do not support querying the user inactivity time, -1 is returned. Tk_ResetUserInactiveTime resets the user inactivity timer of the given display to zero. On windowing systems that do not support multiple displays display can be passed as NULL.

### KEYWORDS

idle, inactive
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