>>Thnk you Cetin, but no... it isn't working.
>>This is my MSGBX code
>>
>>MESSAGEBOX(FULLNAME+" ha quedado inscrito en horario "+xhorario,0,"System Modal",5000)
>
>Change the second parameter to 4096 to make Messagebox SYSTEM MODAL.
>
>Please see Undocumented MESSAGEBOX() parameter values FAQ #7665

That's good... Thanks... :)