HELP ON SCREENING BY KEYWORDS -> SIMILARITY

The user sets:

Keywords Query and List of the fileds in the bank's records.
Query Sequence.
List of Banks to do screenining.

   Screening consists of two stages:

First stage: Screening by keyword
   Only those sequences from the specified banks are selected which in the specified fields contain given keywords.
Second stage: Screening by Similarity
   The screening is made exactly only for those sequences, which were selected on the first stage.

Certanly this kind of screening is much faster than screening on similarity on the whole bank.