glIsList returns GL_TRUE if list is the name of a display list and returns GL_FALSE if it is not, or if an error occurs.
glIsList
A name returned by glGenLists, but not yet associated with a display list by calling glNewList, is not the name of a display list.
Specifies a potential display list name.
determine if a name corresponds to a display list
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glIsListreturns GL_TRUE if list is the name of a display list and returns GL_FALSE if it is not, or if an error occurs.A name returned by glGenLists, but not yet associated with a display list by calling glNewList, is not the name of a display list.