The AAVSO Variable Star Index (VSX) is a large database (repository) with up-to-date information about a very large number of variable stars. It includes a/o the coordinates of each variable star, its variability type, magnitude range, etc. 

If an ObsWin conatins an AAVSO light curve, then the ObsWin Info box will display a subset of the VSX information for the variable star shown in ObsWin: the coordinates (R.A. and Dec.), variability type (Var. type) and the brightness range (Mag range). If you have no active Internet connection, this section is not shown