Any code based protection for a workbook is very weak (the user can always
disable macros).

Any password protection for a workbook is weak (many password cracker
programs available - many free).

All that said, you can write the first use date to the registry (saveSetting
and getsetting methods) and check it on each subsequent use, putting up a
nag dialog.

--
Regards,
Tom Ogilvy

"Yian" wrote in message
...
do u mean put on_time event under cell change or formload?


-----Original Message-----

You can launch an "On_Time" event......to kick off
code...


--
jpendegraft


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