HP 3000 Manuals

MPE/iX Quick Reference Guide

BEGINLOG 

NM and CM callable.
Posts a special record to the user logging file to mark the beginning of
a logical transaction.  When BEGINLOG is called, the logging memory
buffer is flushed to ensure that the record gets to the logging file.
User logging (LG) or system supervisor (OP) capability is required.

               I32  U16A  I16   I16    I16
     BEGINLOG(index,data,length,mode,logstatus)

MPE/iX 5.0 Documentation