HLOOKUP(lookup_value,table_array,row_index_num,range_lookup) searches the top row of an array or a table and returns the value of the indicated cell : HLOOKUP « Lookup Reference functions « Microsoft Office Excel 2007 Tutorial
19. 6. 1. HLOOKUP(lookup_value,table_array,row_index_num,range_lookup) searches the top row of an array or a table and returns the value of the indicated cell
If Range_lookup is TRUE or omitted, an approximate match is returned. The next largest value that is less than lookup_value is returned.
If Range_lookup is FALSE, HLOOKUP will find an exact match.
If one is not found, the error value #N/A is returned.
Referenced from Excel Help
19. 6. HLOOKUP
19. 6. 1.
HLOOKUP(lookup_value,table_array,row_index_num,range_lookup) searches the top row of an array or a table and returns the value of the indicated cell