GLboolean GLAPIENTRY glIsList( GLuint list )
list Specifies a potential display-list name.
glIsList returns GL_TRUE if list is the name of a display 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
GLISLIST(3G)