System Window will be displayed when a data file has been opened,
either by defining a new system or opening a saved data file manually.
The System Window can display a number of different property sheets.
Each of these allow you to determine how the next calculation will be
performed. You can move from one property sheet to another by selecting
the appropriate tab at the top of the window. Only property sheets that
are relevant to the current system will be displayed.
calculations are always possible. If the system has two or
three components you can select respectively either the Binary or Ternary tab in addition
to multiphase and switch between calculation
type, whilst retaining the same status for phases and species.