Poor news, on the other hand, is available to all users who need to use the universal 'Virtual Tablet Interface' driver. With this program, it can be determined whether GRAFIS successfully can recognize the digitizer or not, without having to process a complete GRAFIS installation before. As a tool, we offer for the program 'TABTEST.EXE' which can be found on each GRAFIS CD-ROM in the folder \GRAFIS\HILFEN. The drivers must be tested with the required version of Windows. With all other manufacturers it depends on the quality of the tablet driver. Here, you should rely on a device of a brand manufacturer with good support to avoid later problems in supplying drivers. We had some problems to make it work especially with 64-bit Windows. Only the USB-to-serial adapter have proved problematic in our test. With the current version of the driver package 'TabletWorks' ( download page), Windows 7, 8.1 and 10 can be used in both variants (32-bit and 64-bit Windows 10 tested with 64bit only). For users with a digitizer from GTCO CalComp or Summagraphics there are good news. We have taken the appearance of new Windows version 10 as an opportunity to test the compatibility of digitizers under GRAFIS. News regarding digitizers and 64 bit Windows