[vtkusers] What does the mean? x64 and win32

[chensq]

My vtk works very well. But today I noticed that every project in my vtk is builed with x64 and win32 as shown in the accessory.
I was confused what this mean? I used to think that win32 should go with x86 while x64 should go with win64.
I want to know that in this situation how much memory I could use?
Thank you in advance.
Chen
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