I do that type of stuff in appApplication.BeforeReadEvents.

I.e.

* Require successful logon before application may continue.
* If you dont care about secutity issues, you can remove this line.
*RETURN IIF(ISNULL(THIS.oSecurity), .T., THIS.oSecurity.AutoLogonDialog())
IF DODEFAULT()
*!*		IF THIS.oMeta.oSDTMgr.NeedUpdate()
*!*			THIS.oMeta.oSDTMgr.UPDATE()
*!*		ENDIF
	_screen.Caption = 'Symposium Tracking System'
	m.goStateManager.OpenForm('SetSymp.scx')
ENDIF

HTH,

Sasha

>VFP 6
>CodeMine 6.1.19
>
>I want to put code (based a lot on Craig Berntson's code) to control simultaneous user access to my application.
>
>Where would be the best place to put that code?
>
>I guess that AppMain would be a good place but I don't know where I could place that code.
>
>That code will have to execute right after the user has identified himself or not too long after so that the app. can continue or give an error message and do a shutdown.