Marking of frame.
Press 
on the toolbar; and click necessary stars to mark stars for the
measurement.
If the "Property/Measurement/Centration of
aperture" tag is seted, the centre of the aperture will be a local maximum
of brightness, else the clicked pixel.
If you want to remove a marked star, press 
; and click this star.
The buttons 
/
serve for decrease/increase of the aperture
for last marked star.
If it is necessary to measure a visual double (multiple) star; by others to
words, if the images of stars interact, mark for measurements all components
of the star; press the button 
and click all components of the star.
The measurements will take place on the menu command of "Calculation/Measured
marked", or by 
. The results of measurements are in "izmccd.log"
file.