A series of questions on getting and doing some operations on VO attributes

hi all,
i am fresher working in OA framework...
i have some basic doubt please clear them
1.
v get some parameters for the pages...what is that v get as a parameter.. in the navigated page we give this as URL...
OA.jsp?page=oracle/apps/ak/employee/webui/EmpDetailsPG
&employeeNumber={@EmployeeId}
now what is this EmployeeId ..is this a VO attribute????or a page parameter..i guess it is VO attribute.. just clarify me this...
2.
how to assaign a VO attribute value to other VO attribute..
i mean how to fetch the value of a VO attribute
and assaign a value to VO attribute...
can i use ..******VORowImpl class for this...can please tell me the syntax to fetch
current vo attribute (say employee id).
3.
how to perform the arthemetic operations on VO attributes...
like if i can calculate them by fetching there values and assigning them to local varaibles and storing the result to transient attribute...using set parameter???
can i do this way??
4.i have page table layout region and i have many rows in that ...i have a column say xyz now i want the sum of all xyz in all rows ...is that possible ..if it is how..????
please help me out in this issues...so that i can proceed further with my work..im stuck otu here....if the solution r there in the devguide please tell me where it is ..i mean under which section...bcoz it 1400page document...

Please refrain from posting the same questions in mutiple threads.
Prior to posting the questions please try to search the devguide and the forum.
Yes, the devguide is 1400 pages long, but most of the sections section titles are self-explanatory.

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