_C_a_l_l _a_n _I_n_t_e_r_n_a_l _F_u_n_c_t_i_o_n
	
	     .Internal(call)
	
	_D_e_s_c_r_i_p_t_i_o_n:
	
	     .Internal performs a call to an internal function.
	     Only true R wizards should even consider using this
	     function.
	
	_E_x_a_m_p_l_e_s:
	
	     # evaluate environment and see that it uses .Internal
	     > environment
	     function (fun = NULL)
	     .Internal(environment(fun))