Use the Selection.Filter or Selection::GetFilter property:
// C++ API Selection sel( Application().GetSelection() ); Filter myFilter = sel.GetFilter(); // C# CXSIApplication app = new CXSIApplication(); Selection sel = app.Selection; Filter myFilter = sel.Filter; // JScript var sel = Selection; var myFilter = sel.Filter; ' VBScript set sel = Selection set myFilter = sel.Filter # Python sel = Application.Selection myFilter = sel.Filter # Perl my $sel = $Application->Selection; my $myFilter = $sel->Filter;