Hi, i got a win2k machine, runing with step7 v5.4, for some reasons a teacher give me a Wincc V5.1 license, and i would like to know if i can use both programs without any problems, i heard that to use wincc 5.1 with step7 5.2 you need to install a hotfix, is there something similiar with step 5.4?, thans in advance and congratulations for this forum.