A [Tk] (or rather [Ttk]) [widget] that stacks a bunch of widgets on top of each other in a window, with some tabs at the top to allow users to select between the widgets. A common idiom in Windows's Properties dialogs.
    :   http://www.tcl.tk/man/tcl8.5/TkCmd/ttk_notebook.htm

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A [notebook] may be used as a '''pages manager'''[http://wiki.tcl.tk/17852] by using a style to turn off the tabs, like this (by [Joe English]):
    style theme settings default {
	style layout Plain.TNotebook.Tab null
    }
    ttk::notebook $nb -style Plain.TNotebook

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[tonytraductor]  I have a question.  Using a ttk::notebook, how do I pass the currently selected tab's info to a process, as in,
say I have:

proc prnt {} {
	set data [.txt.$CURRENTAB get 1.0 {end -1c}]
	set fileid [open $::filename w]
	puts -nonewline $fileid $data
	close $fileid
	exec cat $::filename | lpr
}

Short of giving the proc the tab's windowname (ie. .txt.tab1) how can this be done?
I need it to be a variable that I can pass to the process, whether for save/print, etc.
for multiple tabs, without writing a new process and menu bar for each tab.
The problem is, I don't know how to set currenttab {somethinghere}, or what it is that
determines which tab is currently open.
I hope my question is clear.

I assume I should be doing something like 

menubar.file add command -label print -command {print currenttab} -accelerator Ctrl-P

proc print {currentab} {rest of process}

I've looked at the notebook.tcl demo in ActiveTcl-8.5, and there is nothing in the code that
indicates how to determine which tab is open, at least not so far as I can tell.
I looked at krocedit [http://wiki.tcl.tk/12068], too, but that uses a Bwidget, and, I want
to just use the activetcl widget, and, still, even looking at that editor, I was unable to
determine how it was done, anyway.
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!!!!!!
%|[Category Widget]|%
!!!!!!