What: The info you are looking for, it can be a character string or any data type you are looking for in excel.
After: The cell after which you want to find, it corresponds to the active cell when find is made by user interface.
LookIn: Where to look, in formulas (-4123), values (-4163) or notes (-4144)
LookAt: Look at whole or part (1,2)
SearchOrder: By rows (1) or by columns (2)
SearchDirection: Next or previous (1,2)
MatchCase: True for upper and lowercase distinction
MatchByte: only for assian office
You can find this info in the VBA help, and you can use object examiner (sorry for the traduction) in VBA to know values.
Hope this helps