Aposonic A-S1604R4 - Manual (Page 9)

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v. After DVR channels add to the Group views, the user can change the
name of each view. For the following example,
vi. If the user wants the Group View only display I Frame, the user can
click the View No. within the I Frame Only block to adjust the
Real-Time display. (NOTE: Only display I Frame can increase the PC
efficiency.)