void switch_modes (tovt) Bool tovt;
void switch_modes (Bool tovt)
void switch_modes (tovt)    Bool tovt;				/* if true, then become vt mode */{    if (tovt) {	if (TekRefresh) dorefresh();	end_tek_mode ();		/* WARNING: this does a longjmp... */    } else {	end_vt_mode ();			/* WARNING: this does a longjmp... */    }}