The standard histogram package in ALPHA is HBOOK4. If you don't want to use HBOOK, the only system routines which are called automatically and which refer to HBOOK are the histogram initialization / termination routines QUIHIS and QUTHIS (3.5.3 and 3.5.4). Some utility routines which simplify calls to HBOOK routines or provide additional protection against deleting existing histograms are described below. Histogram output is directed by entries in the card file, and is described in section 5.2.