The Siemens part number 6AV6611-0AA51-2CA5 refers to WinCC flexible 2007 Compact, an engineering software package used for configuring SIMATIC HMI Panels up to the 170 series. Here's a quick overview:

Type: Engineering software (WinCC flexible 2007 Compact)

License: Floating license with software and documentation on DVD

Supported Panels: SIMATIC Micro Panels, 70 Series, 170 Series, and C7 devices

Supported OS: Windows XP and Windows 2000

Languages: German, English, French, Italian, Spanish

Net Weight: Approx. 0.100–0.211 kg

Packaging Dimensions: Around 18.70 x 26.80 x 3.30 cm

Lifecycle Status: Discontinued — no longer available from Siemens as of October 1, 2022