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                        LED2 VBX Control  

              Copyright 1994 Northeast Data Corp.

                     All Rights Reserved

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   Release 1.0

   March 1994


This document describes the LED2 Custom VBX Control. 


               CONTENTS

1. Product Description
2. Legal Information
3. Installation
4. Usage
5. Ordering Information

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1. Product Description

The LED2 VBX Control is a Microsoft Windows DLL designed and 
implemented in compliance with Microsoft standards for
interfacing with Visual Basic.

The control appears to the end user as a LED Meter similar to those 
used on audio/video equipment such as stereos, tuners, and amplifiers.

To the application programmer, the interface to the LED2 control is 
simple.  Simply set the value property to a number and the LED2 control
will turn 'on' that number of segments.  Properties also exist to set
the actual number of segments as well as their spacing and width.

Being a VBX control, the programmer can add the LED2 Control to the 
tool palette in Visual Basic. This allows use of the control in Visual
Basic forms. Since Visual C++ supports use of VBX controls, the LED2
control can also be used in the Visual C++ environment.

Use of the LED2 Control in a finished application requires the
LED2 Control DLL (LED2.vbx) to be installed with the application.
This is true of all custom controls written for MS Windows.

There are properties available that allow the programmer to control
the behavior and appearance of the LED2 Control. The control can be
set so that the light segments are displayed either horizontal or 
vertical.  The LED2 control can also have it's segments light up from
left to right, right to left, bottom to top or top to bottom.  The 
thickness of the segments and the spacing between the segments
can be set as well as any colors used in drawing the LED2 control.

All communication between the LED2 Control and the application is 
performed using the standard Windows message mechanism for controls. 

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2. Legal Information

The purchaser of the LED2 Control is allowed to use it and
distribute it in applications without paying any royalty, and without
printing or displaying a copyright notice for the control. This only
includes distribution of the LED2 Control DLL (LED2.VBX). It does 
not include distribution of documentation that comes with the LED2 
Control. 

The purchaser of the LED2 Control may distribute the control DLL with
applications that are networked (multiple users accessing the DLL from
a file server) without paying any license fees to Northeast Data Corp.


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3. Installation

Create a "LED2" directory on your hard disk and copy all files from
the distribution disk to the directory. These files include:


   LED2.VBX       
   FORM1.FRM       
   PROJECT1.MAK       
   README.TXT       
   PROJECT1.EXE 

If you have downloaded the LED2_100.zip file from Compuserve, use
PKUNZIP to extract the files into the directory.

Start Visual Basic or the Visual C++ App Studio applications and use
the custom control installation function to install the LED2.vbx
control.


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4. Usage


PROPERTIES
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   BackColor     - Sets the background color.

   DarkColor     - Sets the color of the segments when they are off.
   
   Direction     - Sets the direction the segments light up. 
                   0 - Normal, 1 - Reversed

   Height        - Height of control.
   
   HighliteColor - Sets the upper bevel color.

   InnerSpace    - Sets the number of pixels between segments.

   LEDType       - 0 - Horizontal, 1 - Vertical
 
   Left          - Left position.

   LightColor    - Sets the color of the segments when they are on.

   Segments      - Sets the number of segments in the meter.
   
   ShadowColor   - Sets the color of the lower bevel.

   SideSpace     - Sets the number of pixels before the first segment 
                   is drawn.

   Thickness     - Sets how thick each segment is.

   Top           - Top of control window.

   Value         - Sets the number of segments that should be turned on.

   Visible       - Visible/Invisible attribute.

   Width         - Width of control.

   
EVENTS
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   No events are supported.


Ordering Information
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To order the commercial version of the LED2 Control, send a check to:

   Northeast Data Corp.
   2117 Buffalo Rd., Suite 290
   Rochester, NY  14624

The prices are:

   LED2 VBX Control (for Visual Basic and Visual C++)    - $55
   
   LED2 DLL Custom Control (for C)                       - $50

   Both controls                                         - $75

   Source code (includes both controls)                  - $235


Include your phone number and Compuserve ID if applicable. In return for
your check, you will get the software, a telephone number for support, and
a Compuserve ID for support.
