>Could you elaborate a bit, please?

to insert a record in the physical table's position N
is as to

- define a integer field
- define a index on field TAG host
- set the active order to the "host" index tag

* insert
- set field = field + 1 for all records with field >= N
and set the insert record's field value to N ( this put the key in physical tag's position N)
* with code
TRY
* BEGIN  TRAN or tablebuffer with FLOCK()
 
 SET ORDER host DESCENDING
 REPLACE ALL WHILE field>=N field with field + 1
 INSERT ... FIELD ... VALUES ... N ....
* END TRAN or tableupdate() and unlock
CATCH
* ROLLBACK
FINALLY
 SET ORDER host
ENDTRY