Hi Hristo
All the VBA source code is in the file LICSSV3.2.xla which is in the directory c:\services\licss-3.2 (if you accepted the defaults when installing). However, if you have LICSS 3.2 installed, open Excel and select <Alt F11> to bring up the VBA editor. Choose the LICSSv3 project. The code for inserting the structures is the subroutine 'StructureToggle' in the module 'StructureServer'. This is in essence a routine which uses polling to find out if Excel needs any structures drawing. It calls the C++/Java routine 'SmilesImageToClipboard' to get the structure images.
Please let me know if you need any more information.
Best wishes
Kevin