hi folks I searched the forum but didn't found a solution. When I press the help button in uVision3 for example in the dialog box 'option for Target XZY' the Microsoft precompiled help system starts. Normaly the help system is another task in Windows and task switching can be done with ALT-TAB. This works not for uVision/help system. Here uVision and the help system appears as one application and it is inpossible to change between uV3 and the help. It's very unuseful that ALT-TAB won't work. It happens with Win98 and WinXP. Is there an option to change this behavior? greetings - Günter