Mark In Button
Clicking on this button copies the time code from the
time code window into the mark in column of the current
clip in the log. Pressing this button multiple times will
continue to overwrite the number in the mark in column.

A NOTE OF CAUTION...Be sure that the clip in the log
that you wish to change is the active one,
(the little page icon is in the far left column of the log,)
before you click on this button or you may overwrite a
mark in that you didn't want to.

If video is actively connected to the PC, this button will
also grab a new thumbnail image.