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                        LED1 VBX Control  

              Copyright 1994 Northeast Data Corp.

                     All Rights Reserved

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   Release 1.0

   March 1994


This document describes the LED1 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 LED1 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 similar to those 
used on audio/video equipment such as stereos, tuners, and amplifiers.
This particular LED control displays numbers.

To the application programmer, the interface to the LED1 is very
simple.  Simply set the value property to a number and the LED1 control
will display it.  Since the LED control only displays one digit at a time
the range of valid values is 0-9.

Being a VBX control, the programmer can add the LED1 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 LED1
control can also be used in the Visual C++ environment.

Use of the LED1 Control in a finished application requires the
LED1 Control DLL (LED1.vbx) to be installed with the application.
This is true of all custom controls written for MS Windows.



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2. Legal Information

The purchaser of the LED1 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 LED1 Control DLL (LED1.VBX). It does 
not include distribution of documentation that comes with the LED1 
Control. 

The purchaser of the LED1 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 "LED1" directory on your hard disk and copy all files from
the distribution disk to the directory. These files include:


   LED1.VBX       
   FORM1.FRM       
   PROJECT1.MAK       
   README.TXT       
   PROJECT1.EXE 

If you have downloaded the LED1_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 LED1.vbx
control.


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4. Usage


CUSTOM PROPERTIES
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   Value - Sets the value to be displayed in the control.  Valid values
           are 0-9.


   
CUSTOM EVENTS
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   None.


Ordering Information
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To order the commercial version of the LED1 Control, send a check to:

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

The prices are:

   LED1 VBX Control (for Visual Basic and Visual C++)    - $55
   
   LED1 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.