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 5.2.4 Other Help
1. A user may provide help and sometimes (rarely) get help for a user-defined function using the Help feature of the Define command.

 Example
 ``` Help(); Type Help(< Op >) to get help on operator < Op > ------------------------------- Help("GBasis"); -- note the typical response, one of the main -- motivations for the author of the online manual. No help available for GBasis ------------------------------- ```
 ``` Describe Function("Insert"); Define Insert(L, I, O) \$list.Insert(L, I, O) EndDefine; ------------------------------- Describe Function("\$list.Insert"); Define Insert(L, I, O) If NOT(Type(L) = LIST) Then Return(Error(ERR.BAD_PARAMS,": expected LIST")) ElsIf I = Len(L) + 1 Then Append(L, O) ElsIf I > Len(L) Then Return(Error(ERR.INDEX_TOO_BIG, I)) ElsIf I <= 0 Then Return(Error(ERR.INDEX_NEG, I)) Else L := Concat([L[J]|J In 1..(I - 1)],[O],[L[J]|J In I..Len(L)]); EndIf; EndDefine; ------------------------------- ```
 ``` Functions("\$mat"); [About(), Man(), Identity(N), Transposed(M), Submat(M, Rows, Cols), Jacobian(S), Resultant(F, G, X), DirectSum(M1, M2), BlockMatrix(LL), ColumnVectors(M), Complement(M, I, J), Bip(M, J), Pfaffian(M), Sylvester(F, G, X), ExtendRows(M, N), PushRows(M, N), ConcatRows(L), PkgName()] ------------------------------- ```
 ``` Starting("Su"); ["SubstPoly", "SubSet", "Submat", "Sum", "Subst", "Support"] ------------------------------- ```