Bank Recon uses simple SOAP web services ( find more on SOAP here: http://en.wikipedia.org/wiki/SOAP) which allow for the bi-directional transfer of data.
All methods and their details can be found by navigating to the web services url: http://localhost/bankrecon/WebServices/WebServices.asmx on the server hosting the web site, or replace localhost with the server name if browsing remotely.
The methods defined perform many of the standard Bank Recon functions including imports, reconciliations, cashbook transfers, general ledger export and viewing, editing and deleting detail. They require a username, password and Domain Group Id, Domain Id or Account Id. Some also require a particular Transaction Id or definition name (recon rule name, GL Export definition name etc) in order to execute.