In addition to my previous message: Now i know what is SDK (Software development Kit). I've read the documentation of the winfax sdk. As far as i know i must registry the library 'wfxipsrv.dll' with the regsrv32.exe, but i dont find this library in any place. I have installed the winfax and the patch 8.03. Where can i find this dll ???. createobject("winfax.sdksend") doesnt works for me. What i'm doing wrong ???. Thanks again