ISINTERNAL
ISINTERNAL(sp) ? PGNO_INVALID : argp->right,
ISINTERNAL(sp) ? PGNO_INVALID : argp->left,
ISINTERNAL(sp) ? PGNO_INVALID : PREV_PGNO(sp),
ISINTERNAL(sp) ? PGNO_INVALID : argp->right,
ISINTERNAL(sp) ? PGNO_INVALID : sp->pgno,
ISINTERNAL(sp) ? PGNO_INVALID : NEXT_PGNO(sp),
PGNO_INVALID, ISINTERNAL(cp->page) ? PGNO_INVALID : rp->pgno,
ISINTERNAL(cp->page) ? PGNO_INVALID : lp->pgno, PGNO_INVALID,
ISINTERNAL(cp->page) ? PGNO_INVALID : cp->page->pgno,
ISINTERNAL(cp->page) ? PGNO_INVALID : cp->page->next_pgno,
ISINTERNAL(cp->page) ? PGNO_INVALID : cp->page->prev_pgno,
ISINTERNAL(cp->page) ? PGNO_INVALID : rp->pgno,
((ISINTERNAL(pp) && cp->indx == NUM_ENT(cp->page) - 1) ||
(!ISINTERNAL(pp) && cp->indx == NUM_ENT(cp->page))))