What is the variable 'vbyes' classified as?

[dmasters4919]

Whenever a message box returns a yes or no, it's really returning an integer 6 for yes or 7 for no. However, I originally thought that it was literally just returning a special variable thats only value was vbyes or vbno. Does MSDN have a name for an intrinsic variable that holds an integer value?

[Norie]

vbYes and vbNo are VBA constants, you'll find all the constants listed in the Object Browser (F2).