Return window related information.

http://www.purl.org/tcl/home/man/tcl8.4/TkCmd/winfo.html


See [wm] for [Window manager] related information.

---- 
Notice that the return value of [[winfo id ...]] is the id used
by [toplevel] and [wish] in
    toplevel ... -use $id
and
    wish ... -use $id
----

[Tk syntax help] - [Arts and crafts of Tcl-Tk programming]