Lock record on query for single user

Is there any way to use the on-lock trigger to lock a particular record as it is simply queried, instead of after a change has been made to it. For instance, if user A is viewing a queried record, and user b attempts to query the same record, then we would display a message to user b stating that the record is unavailable, or simply just skip it. I know that if a field in the current record is altered, forms recognizes the status of the record as 'CHANGED' and will then by default proceed to lock the record until a commit or rollback is issued. However, this is not what we are looking for. I have read a little about this, and I have seen an example through a datablock based upon a stored procedure, a ref cursor select for update statement. (NOTE: we are not basing our datablock on a stored procedure though)
We have two scenarios that require this type of locking capability. The first simply queries one distinct record, and the second queries a distinct result of records.
A select for update statement would suffice for the first scenario, i.e. if another user tries to query the same record, their query is denied; however, for the second scenario when two users perform the same query, user a is viewing record #1, and user b's program sees that record #1 is 'locked' and thus proceeds to the next record in the result .
Any suggestions? Thanks in advance.
Eric M Weiss

You don't need to override on-lock you can just call the LOCK_RECORD built-in in POST-QUERY or whatever.

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