Com32upd.exe and Windows 95 Tooltips and datatips, which are new features in MATLAB 5.2, do not display correctly if your machine contains a version of comctl32.dll prior to version 4.70. Tooltips are used to display textual information associated with a uicontrol. Datatips are used to display textual information associated with a variable in the MATLAB Editor/Debugger. For additional information, refer to the to MATLAB 5.2 New Features Guide. To determine the version of comctl32.dll your machine is running, do the following: 1. In Windows Explorer, go to c:\Win95\System 2. Right click on comctl32.dll 3. Select Properties 4. Select the Version tab Users who do not have comctl32.dll version 4.70 or higher should run Com32upd.exe to obtain full functionality of tooltips and datatips.