Measurement Computing Micro 488/EX rev.2.1 - Manual (Page 78)

Section 5 Command Descriptions
5.8
If a command is preceded by an asterisk then that command is
unasserted. For example, *REN states that the remote enable line is
unasserted. Conversely, REN without the asterisk states that the line
becomes asserted.
5.2.5 Examples
This section gives programming examples written in the BASIC
language.
5.3 The Commands
The commands provided in the Micro488/EX, in alphabetical order, are
described on the following pages.