| ActiveTcl User Guide |

## Tcl/Tk Documentation > TkLib > IdToWindow

### Tcl/Tk Applications | Tcl Commands | Tk Commands | Tcl Library | Tk Library

### 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
Copyright © 1995-1997 Roger E. Critchlow Jr. Copyright © 1995-1996 Sun Microsystems, Inc.