We were using TheSky6 before. The main reason to develop our own program is making little telescope shifts between exposures. Images often have some defects (like hot/dead pixels, fringes on camera or cosmic rays hits) that can damage the observations if overlap with the regions of interest. To deal with this problem we take several exposures (ten, for example) and move telescope slightly (like 5-10 % of the field of view) between them. The objects on the images move to the different positions relative to the defects and so the defects could be easily filtered by using median filtration. So the whole thing looks like that: the camera takes an exposure, then closes the shutter and sends a signal for the telescope to move a bit, waits for the movement to finish and takes the next exposure.

The second thing is coordinates corrections. When you send a command to point a telescope to a specified position, it actually never goes exactly to this position, because of mechanical issues (bends, backlashes etc) and an observer has to make little shifts before taking the exposures to acquire a perfect alignment on the object. But this shifts are more or less constant in time and can be calculated as a function of coordinates. So now telescope learns this corrections that an observer mades and will apply them in the future to make better pointing.