International Business and Open Source Conference (IBLOC) is the most important event of these kind in the Southeast Europe. Fourth IBLOC conference, taking place this year, will offer even more practical answers and concrete solutions about Open Source systems than any other conference has offered so far. Many foreign experts will present their ideas and experiences, among others one of the Mozilla developers Brian King, world known Internet expert Ric Shreves, whose company Water & Stone has developed web pages for companies such as BASF and Colgate - Palmolive, and Boško Radojevič- technical manager of the company Eunet - Yunet International, which is the biggest supplier of Internet solutions in Serbia and Montenegro. Slovene spokesmen will present the usage of Open Source in local companies. Topmost conference, whose creators are GV Izobraževanje (GV training center) and ISG, will take place on 29 and 30 September in Portorož. Estimated number of participants ( IT managers and technical developers) amounts to 300.