Sync plugin doubts

Question

Hi Shane
Hi shane my client need custom sync plug that is
if i create a user defined fields that fields should sync in business one database
pls guide me how to start with custom plugin
herewith iam sending sync plugin tester sample coding my questions below
1)  what is security ticket in sync plugin?
2) what is SBOQUEUE?
private void button1_Click(object sender, System.EventArgs e) {
            WriteNote("Starting Plugin synch.");
            try {
                // Get the NPSynchConfig data for this profile
                SecurityTicket st = profiles[cboProfiles.SelectedValue.ToString()];
                // Connect to the Business One company
                Company c = GetCompany(st);
                // Load the Business Partner Queue from PRX_Transaction_Queue
                SBOQueue q = new SBOQueue(c, st, SBOObjectTypes.BusinessPartners);
                q.GetQueue();
                if (q.QueueObjects.Count == 0) {
                    WriteNote("The queue is empty. Exiting synch.");
                } else {
                    WriteNote("There are " + q.QueueObjects.Count.ToString() + " items in the business partner queue.");
                // Run the plugin
                SynchPlugin.MyPlugIn pi = new SynchPlugin.MyPlugIn(c, st);
                pi.B1Queue = q;
                pi.NetPointQueue = new NPQueue(st, SBOObjectTypes.BusinessPartners);
                pi.Synch();
                //  clear the queue of synched objects
                //  this should not be done in the plugin (the synch will do so)
                pi.B1Queue.Clear();
                WriteNote("Plugin Synch complete.");
            } catch (System.Exception ex) {
                WriteNote(ex.Message + System.Environment.NewLine + ex.StackTrace);
                WriteNote("Plugin Synch failed.");
Regards
Kannan.D

Answer 1

First you must understand how the plugins work.
The synch determines which records to synchronize based on on two tables.
In Business One the table is PRX_Transaction_Queue.  This table has a record added for each SQL transaction that occurs in Business One.  These records are used to determine which data need to synch to Webtools.
In Webtools, there is a sister table, TransactionQueue, which records all SQL transactions that occur within Webtools and determine which data to synch to Business One. 
When each synch cycle begins, the synch loads all of the data from the above two tables into memory.
Next, the synch examines the local plugins directory to see if there are any synch plugins marked to run PRIOR to the synch.  If so, the queue in memory is passed to the plugin to process.
The synch runs.
Next, the synch examines the local plugins directory to see if there are any synch plugins marked to run AFTER to the synch.  If so, the queue in memory is passed to the plugin to process.
When the synch cycle completes, all successfully synchronized data are removed from the transaction tables.