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+'\"
+'\" Copyright 1991-1997 by Bell Labs Innovations for Lucent Technologies.
+'\"
+'\" Permission to use, copy, modify, and distribute this software and its
+'\" documentation for any purpose and without fee is hereby granted, provided
+'\" that the above copyright notice appear in all copies and that both that the
+'\" copyright notice and warranty disclaimer appear in supporting documentation,
+'\" and that the names of Lucent Technologies any of their entities not be used
+'\" in advertising or publicity pertaining to distribution of the software
+'\" without specific, written prior permission.
+'\"
+'\" Lucent Technologies disclaims all warranties with regard to this software,
+'\" including all implied warranties of merchantability and fitness.  In no event
+'\" shall Lucent Technologies be liable for any special, indirect or
+'\" consequential damages or any damages whatsoever resulting from loss of use,
+'\" data or profits, whether in an action of contract, negligence or other
+'\" tortuous action, arising out of or in connection with the use or performance
+'\" of this software.  
+'\"
+.so man.macros
+.TH intro n BLT_VERSION BLT "BLT Built-In Commands"
+.BS
+'\" Note:  do not modify the .SH NAME line immediately below!
+.SH NAME
+BLT \- Introduction to the BLT library
+.BE
+.SH DESCRIPTION
+BLT is a library of extensions to the Tk library.  It adds new
+commands and variables to the application's interpreter.
+.LP
+.SH COMMANDS
+The following commands are added to the interpreter from the BLT library:
+.TP 15
+\fBtable\fR 
+A table geometry manager for Tk.  You specify window placements as table 
+row,column positions and windows can also span multiple rows or columns. 
+It also has many options for setting and/or bounding window sizes.
+.TP 15
+\fBgraph\fR 
+A 2D plotting widget.  Plots two variable data in a window with an optional 
+legend and annotations.   It has of several components; coordinate axes, 
+crosshairs, a legend, and a collection of elements and tags.
+.TP 15
+\fBbarchart\fR 
+A barchart widget.  Plots two-variable data as rectangular bars in a 
+window.  The x-coordinate values designate the position of the bar along 
+the x-axis, while the y-coordinate values designate the magnitude.
+The \fBbarchart\fR widget has of several components; coordinate axes, 
+crosshairs, a legend, and a collection of elements and tags.
+.TP 15
+\fBvector\fR 
+Creates a vector of floating point values.  The vector's components
+can be manipulated in three ways: through a Tcl array variable, a Tcl
+command, or the C API.
+.TP
+\fBspline\fR
+Computes a spline fitting a set of data points (x and y vectors) and
+produces a vector of the interpolated images (y-coordinates) at a
+given set of x-coordinates.
+.TP 15
+\fBbgexec\fR 
+Like Tcl's \fBexec\fR command, \fBbgexec\fR runs a pipeline of Unix 
+commands in the background.  Unlike \fBexec\fR, the output of the last
+process is collected and a global Tcl variable is set upon its completion.
+\fBbgexec\fR can be used with \fBtkwait\fR to wait for Unix commands
+to finish while still handling expose events.  Intermediate output is
+also available while the pipeline is active.
+.TP 15
+\fBbusy\fR 
+Creates a "busy window" which prevents user-interaction when an
+application is busy.  The busy window also provides an easy way 
+to have temporary busy cursors (such as a watch or hourglass).
+.TP 15
+\fBbitmap\fR 
+Reads and writes bitmaps from Tcl.  New X bitmaps can be defined
+on-the-fly from Tcl, obviating the need to copy around bitmap files.  
+Other options query loaded X bitmap's dimensions and data.
+.TP 15
+\fBdrag&drop\fR 
+Provides a drag-and-drop facility for Tk.  Information (represented
+by a token window) can be dragged to and from any Tk window, including
+those of another Tk application.  \fBdrag&drop\fR acts as a 
+coordinator, directing Tk \fBsend\fR commands between (or within) TCL/Tk 
+applications. 
+.TP 15
+\fBhtext\fR 
+A simple hypertext widget.  Combines text and Tk widgets into a single
+scroll-able window.  Tcl commands can be embedded into text, which are
+invoked as the text is parsed.  In addition, Tk widgets can be
+appended to the window at the current point in the text.  \fBHtext\fR
+can be also used to create scrolled windows of Tk widgets.
+.TP 15
+\fBwinop\fR 
+Raise, lower, map, or, unmap any window.  The raise and lower functions
+are useful for stacking windows above or below "busy windows".
+.TP 15
+\fBwatch\fR 
+Arranges for Tcl procedures to be called before and/or after the execution
+of every Tcl command. This command
+may be used in the logging, profiling, or tracing of Tcl code.
+.TP 15
+\fBbltdebug\fR 
+A simple Tcl command tracing facility useful for debugging Tcl code.  
+Displays each Tcl command before and after substitution along its level 
+in the interpreter on standard error.
+.SH VARIABLES
+.PP
+The following Tcl variables are either set or used by BLT at various times
+in its execution:
+.TP 15
+\fBblt_library\fR
+This variable contains the name of a directory containing a library
+of Tcl scripts and other files related to BLT.  Currently, this 
+directory contains the \fBdrag&drop\fR protocol scripts and the 
+PostScript prolog
+used by \fBgraph\fR and \fBbarchart\fR.
+The value of this variable is taken from the BLT_LIBRARY environment
+variable, if one exists, or else from a default value compiled into
+the \fBBLT\fR library.
+.TP 15
+\fBblt_versions\fR 
+This variable is set in the interpreter for each application. It is an 
+array of the current version numbers for each 
+of the BLT commands in the form \fImajor\fR.\fIminor\fR.  \fIMajor\fR and
+\fIminor\fR are integers.  The major version number increases in
+any command that includes changes that are not backward compatible
+(i.e. whenever existing applications and scripts may have to change to
+work with the new release).  The minor version number increases with
+each new release of a command, except that it resets to zero whenever the
+major version number changes.  The array is indexed by the individual 
+command name.
+.SH ADDING BLT TO YOUR APPLICATIONS
+It's easy to add BLT to an existing Tk application.  BLT requires no 
+patches or edits to the Tcl or Tk libraries.  To add BLT, simply add the 
+following code snippet to your application's tkAppInit.c file.  
+.CS
+if (Blt_Init(interp) != TCL_OK) {
+    return TCL_ERROR;
+}
+.CE
+Recompile and link with the BLT library (libBLT.a) and that's it.
+.PP
+Alternately, you can dynamically load BLT, simply by invoking the
+command
+.CS
+package require BLT
+.CE
+from your Tcl script.
+.SH BUGS
+Send bug reports, requests, suggestions, etc. to 
+gah@siliconmetrics.com or ghowlett@grandecom.net
+.SH KEYWORDS
+BLT