CacheSetConnection ( hConnection ) -> hOldConnection
The function sets the current connection to <hConnection> which will be used by the subsequent Caché*() functions plus DbCreate() and DbUseArea() RDD functions.
Typically this function is called when multiple connections are opened with CachéAddConnection() or CachéAddConnectionEx() functions. If only one connection is obtained, there is no need to call this function any time.
