In UniLogic, you can export any Ladder Function or C Function for reuse as a UDFB. In the Solution Explorer, right-click the function name and select Export. UniLogic saves the UDFB as a UniLogic Ladder Export File (*.ulle) which you can import into other programs or share with other programmers. To import a UDFB, right-click on the module you wish to add it to and select Import Function. In addition, you can store all of your UDFBs in the Library, located on the Solution Explorer. The Unitronics forum has a special section for sharing UDFBs: http://forum.unitronics.com/index.php?/forum/70-unilogic-udfbs/