Data Buffer Classes
In PeopleCode there are four data buffer classes

1. Rowset Class
2. Row Class
3. Record Class
4. Field Class

Order of these classes will be
Rowset > Row > Record > Field 

Ex:

 Standard form

Local  RowSet  &Rs0,&Rs1,&Rs2;
Local Row        &Row0,&Row1,&Row2;
Local Record   &Rec0,&Rec1,&Rec2;
Local Filed       &Field,&Field2;

&Rs0 = GetLevel0();
&Row0 = &Rs0.GetRow(1);
&Rs1 = &Row0.GetRowset(Scroll.Z_CLASS);
&Row1 = &Rs1.GetRow(2);
&Rs2 = &Row1.GetRowset(Scroll.Z_SECTION_REC);
&Row2 = &Rs2.GetRow(3);
&Rs3 = &Row2.GetRowset(Scroll.Z_STUDENT_REC);
&Row3 = &Rs3.GetRow(3);
&Rec2 = &Row3.GetRecord(Record.Z_STUDENT_REC);
rem &Row2=&Rec1.GetRow(3);
&Field2 = &Rec2.GetField(Field.NAME);
rem &Row3=&Field1.GetRow(3);
WinMessage(&Field2.Value);

Short form

&RQ_Lvl0 = GetLevel0();
   &RQ_Lvl1 = &RQ_Lvl0(1).GetRowset(Scroll.HRS_JO_RQMT);
   &RQ_Lvl1(1).HRS_JO_RQMT.SAL_ADMIN_PLAN.Value = &SAL_ADMIN_PLAN;