Description: Since a window can use more than one menu, so GLUT by an integer identifier for the menu offers a way to achieve multi-window management. The integer identifier is created by the system in the menu in sequence, starting from a distribution can usually be obtained with the following statement this identifier:
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roam\roam.cpp
....\roam.dsp
....\roam.dsw
....\roam.ncb
....\roam.opt
....\roam.plg
....\Debug
roam