Use the CC field to copy other recipient(s) you want to copy on the email. This field is used to keep others posted on the subject of the email, but is not intended to include the primary recipients of the email. For example, if you are mailing a project schedule to your team, you can use the CC field to copy your boss about the schedule.
HyperOffice also allows you to select recipient(s) from your groups/contacts by clicking the button.