## Tcl8.6.0/Tk8.6.0 Documentation > Tk C API, version 8.6.0 > IdToWindow

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### NAME

Tk_IdToWindow — Find Tk's window information for an X window

### SYNOPSIS

#include <tk.h>
Tk_Window
Tk_IdToWindow(display, window)

### ARGUMENTS

Display *display (in)
  X display containing the window.

Window window (in)
  X id for window.

### DESCRIPTION

Given an X window identifier and the X display it corresponds to, this procedure returns the corresponding Tk_Window handle. If there is no Tk_Window corresponding to window then NULL is returned.

### KEYWORDS

X window id
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