Most of the Virtualization products developed by VMware,Citrix,Microsoft etc are written in which language?

VMware's virtualization products are mostly in C and a bit of x86 assembly, with C++ or other languages for the GUIs. Other languages are used in various other bits, but the above three cover the majority.

An educated guess by the fact that these programs have to access very low level hardware would be they are all written in C and C++.

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