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<td width="90%"><font size="4" face="Verdana, Arial, Helvetica"><b>Tk commands, Part 1</b></font></td><td width="200" align="right"><font size="1" face="Verdana, Arial, Helvetica"><nobr>   第 4 页（共7 页）</nobr></font></td>
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<p>There are over 20 Tk commands, that act on, enhance, or 
				complement the Tk widget set. These include <i>bell</i>, 
				which rings the bell, depending on the configuration of the 
				X Window system that's running.  <i>bind</i> creates an 
				association between a Tcl script and X events; for example, a specific 
				key-mouse combination action. <i>clipboard</i> is 
				another of the multi-function Tk commands -- it contains all 
				the code for clearing, loading, and pasting contents to and 
				from the Tk clipboard (which is distinct from any clipboard 
				features native to either X or the window manager you're 
				using).</p>
<p>
<i>destroy</i> is used to delete a window and all of its 
				children. Used on the '.' (root) window, it deletes 
				the entire application. <i>event</i> is a powerful tool for 
				generating virtual window events and inserting them into the 
				processing queue, as though the actual event (a mouse click on a 
				button, for example) had happened for real. The <i>font</i> 
				command is used to create specified instances of system fonts. 
				It permits local (to the script) naming of system fonts, attribute 
				modification of named fonts, and "deletion" of fonts. Type 
				<b>font families</b> at a <i>wish</i> prompt for a listing of 
				available fonts for use.</p>
<p>Focus is an important concept in the window management arena --  
				in any given display, only one window at a time may have the 
				"attention" of the keyboard and mouse. The Tk <i>focus</i> 
				command is used to give the script control over the display 
				focus, sending it to specified windows. A complementary function,
				<i>grab</i>, allows Tk to monopolize the display focus to the 
				point where events outside the window are reported within the 
				window's environment. This is useful when you want to force 
				completion of an option prior to any other system activity 
				taking place.</p>
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