- determine if a name corresponds to a display-list
_param1 Specifies a potential display-list name.
glIsList returns GL_TRUE if _param1 is the name of a dis- play list and returns GL_FALSE otherwise.
GL_INVALID_OPERATION is generated if glIsList is executed between the execution of glBegin and the corresponding execution of glEnd.
glCallList, glCallLists, glDeleteLists, glGenLists, glNewList 1