VFP is not multithreaded. You could accomplish this if you spin off the report process to another EXE after the user has entered their criteria.

>In order to fully understand the problem, I have to explain in detail whats happening.
>I am using VFP 6 SP3. I have a Sales & Order processing application. There are many
>reports within the system and they all suffer from this same problem. Each report has
>a form which allows the user to set some criteria for the report. When they are ready
>they press the OK button and then I call a prg to process the data files. Each prg contains
>code similar to the following...
>
>DO While NOT EOF('Customer')
>
> *!* after every 100 records I issue a DOEVENTS
> IF m.nCounter >= 100
> DOEVENTS
> IF Lastkey() = KEY_ESCAPE
> m.lAbort = .T.
> EXIT
> ENDIF
> m.nCounter = 0
> ENDIF
>
> *!* calculate some figures here
> * bla bla bla
>
> m.nCounter = m.nCounter +1
> SKIP +1 IN Customer
>ENDDO
>
>While the above prg is running I want my users to able to go to my application's menu
>and maybe they can do an accounts enquiry or do some other data entry while they are waiting,
>but my application will not respond to any mouse clicks or menu clicks.
>Is there a way to get VFP to handle different process at the same time.
>
>I have _VFP.Autoyield set to .T.