Due to their large size, the Visual Basic 4.00 run-time libraries 
have not been included. 
 
 
For the DS1991 buttons, 1 Visual Basic (VB) example program exists on Disk 2 of the Software 
Developer's Kit.  It is located in the WIN16\DEMOS\VB\DS1991 directory. Since object files (*.obj) 
cannot be linked to a Visual Basic program, please use SACWD400.DLL.  The program is called 
SKEYVB.EXE.  A DLL, called SKEY.DLL, has also been linked, along with SACWD400.DLL, to the 
program.  The SKEY.DLL contains higher level functions for reading and writing to the three protected 
memory areas (referred to as sub-keys--thus, the name SKEY) of the DS1991 in a DS1410E.  The 
developer can use this DLL whenever he/she is working with the DS1991 to protect the application being 
developed.  This DLL can be called from other programming languages.  Linking statically or 
dynamically is up to the programmer and the capabilities of his/her compiler.  Please note that linking 
statically is more secure than linking with a DLL.  The SKEYVB program steps through the functions of 
the SKEY.DLL, and the source to both exists in the WIN16\DEMOS\VB\DS1991\SOURCE directory. 

