From Help for FLUSH:
"You can use FLUSH to explicitly save to disk all changes that you make to all open tables and indexes. You can also save changes to a specific table by specifying a work area, table alias, or path and name of a currently opened file.

If you do not specify nWorkArea, cTableAlias, or cFileSpec, FLUSH applies to all open tables and indexes in the current data session.
"

From Help for TABLEUPDATE:
"Commits changes made to a buffered row, a buffered table, cursor, or cursor adapter.

If you issue TABLEUPDATE( ) and row or table buffering is not enabled, Visual FoxPro generates an error message. However, TABLEUPDATE( ) can still commit changes to a table or cursor that has validation rules.
"

So, as You can see these commands are used for the different goals.

WBR, Juri