Hi,
I am researching on how to create and implement a VBA app. to run in
the background and then 'alarm' when a certain time has elapsed and
then a certain temperature value has been reached. The sheet will be
updated by an add in for Aspen Process Explorer but I need help with
the following please:

1/ How can I get the program to run 'invisibly' as it were and then
make the app become active when not so. (is it appactivate?)
2/ What is the best way to achieve a 'pop up' and 'audio' alarms from
either the countdown timer or a value being matched?
3/ How can I stop the application from being closed down unauthorised.
(i.e. it needs to continue to run in the backround while other apps
are used.)

Thanks for any pointers
Regards
Gary

P.S.
I have had a search through the group but a little specific help would
be greatly appreciated.