dsoframer是微软提供一款开源的用于在线编辑、调用Word、 Excel 、PowerPoint等的ActiveX控件。国内很多著名的OA中间件，电子印章，签名留痕等大多数是依此改进而来的。(lvpadnet is base microsoft office dsoframer.ocx . by c#.net　and vba ecapsulation. provide elect doc solution for spec industry. supply assistant input,role verify,auto format,data pick,etc. for instance: electronic case history. etc.)