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Next: <a href="Getting-Started.html#Getting-Started" accesskey="n" rel="next">Getting Started</a>, Previous: <a href="General.html#General" accesskey="p" rel="prev">General</a>, Up: <a href="General.html#General" accesskey="u" rel="up">General</a> [<a href="wm.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>]</p>
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<a name="Introduction-1"></a>
<h3 class="section">1.1 Introduction</h3>
<p><b>GCL-TK</b> is a windowing interface for <b>GNU Common Lisp</b>. It provides the
functionality of the <b>TK</b> widget set, which in turn implements a widget
set which has the look and feel of <b>Motif</b>.
</p>
<p>The interface allows the user to draw graphics, get input from menus,
make regions mouse sensitive, and bind lisp commands to regions. It
communicates over a socket with a <samp>gcltksrv</samp> process, which speaks to the
display via the <b>TK</b> library. The displaying process may run on
a machine which is closer to the display, and so involves less
communication. It also may remain active even though the lisp is
involved in a separate user computation. The display server can, however,
interrupt the lisp at will, to inquire about variables and run
commands.
</p>
<p>The user may also interface with existing <code>TCL/TK</code> programs,
binding some buttons, or tracking some objects.
</p>
<p>The size of the program is moderate. In its current form it adds only
about 45K bytes to the lisp image, and the <samp>gcltksrv</samp> program uses shared
libraries, and is on the order of 150Kbytes on a sparc.
</p>
<p>This chapter describes some of the common features of the command
structure of widgets, and of control functions. The actual functions
for construction of windows
are discussed in <a href="Widgets.html#Widgets">Widgets</a>, and more general functions
for making them appear, lowering them, querying about them in <a href="Control.html#Control">Control</a>.
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