DMDX Help.

Indexed Branch Keyword

<IndexedBranch N>
<ib N>

Indexed Call Keyword

<IndexedCall N>
<ic N>

    Performs a branch based on the value of counter number N. See <Branch> and <SetCounter>. To perform a branch to an item number earlier in the item file counter number N's value will have to be negative.

    There's actually a couple of examples that use <ib> in the Dynamic Item Content help.

DMDX Index.