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Names["NDSolveFEMGroup"] {"GroupBoundariesByNormals", "MeshElementGroupQ"}

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Not sure if it is your question, but you can use

Information[NDSolve`FEM`MeshElementGroupQ]

which prints

NDSolveFEMMeshElementGroupQ

Attributes[NDSolveFEMMeshElementGroupQ]={Protected,ReadProtected}

-> To access nested environments use the ` character

To filter available symbols you can use something like:

Flatten@StringCases[Names["NDSolve`*`*"], ___ ~~ "Boundary" ~~ ___ ~~ "Condition" ~~ ___]

which prints (under MMA v10)

{"NDSolveFEMBoundaryCondition", "NDSolveFEMBoundaryConditionData", "NDSolveFEMBoundaryConditionDataOld", "NDSolveFEMBoundaryConditionMeshPositions", "NDSolveFEMBoundaryConditionPredicate", "NDSolveFEMDeployBoundaryConditions", "NDSolveFEMDiscretizeBoundaryConditions", "NDSolveFEMDiscretizeBoundaryConditionsOld", "NDSolveFEMDiscretizedBoundaryConditionData", "NDSolveFEMInitializeBoundaryConditions", "NDSolveFEMInitializeBoundaryConditionsOld", "NDSolveFEMParseBoundaryConditions", "NDSolveFEMParsePreBoundaryConditions", "NDSolveFEMPreBoundaryCondition", "NDSolveFEMReprocessBoundaryConditions"}

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