SIMATIC S7, S7-PLCSIM V5.4 floating license for 1 user engineering software, software and documentation on CD, license key on USB flash drive, class A, 5 languages(de,en,fr,es,it) from STEP7 V5.4 SP4 or SP5 or STEP 7 V5.5 with or without SP1 Windows XP Professional, Windows 7 Professional/Ultimate, reference hardware: PG/PC - - content: set (1x CD + 1x USB)