sentences:  These mobile devices typically have hardware constraints, with limited RAM and few CPU cycles available and non-standard (for database systems) operating requirements (such as support for Java ME, or Silverlight in the Windows Phone 7 mobile platform).Currently available versions of Perst are Perst for .NET, Perst for Java and Perst Lite.Perst for Java and Perst Lite are bundled in a single software distribution.