[DUG] Sending notification between programs

[John Bird]

Which way would you favour to do the following ?

I have two Delphi programs (A and B) that I will pass data from A to B - I will probably use  a file to put the data in because its quite structured.   B will sleep on a timer loop until this something is triggered.

What I want to do is send a simple notification from program A to B that there is something to do - i.e. trigger an event in B to wake and do something to process this.

There are various ways I could communicate this notification

1 - Has to add minimal overhead of size and processing to programs A and B
2 - A can tolerate B not responding immediately without freezing but preferably will know

The ways I have considered to be candidates are

a - Windows messaging
b - TCP/IP Indy   (which could send the data too.  (adds complexity of needs to be done in a thread to not affect the main program A)
c - make program B a DLL
d - Roll my own - make a timer in B which polls for for some condition and otherwise continues to sleep
e - something else.

Kindly share your favoured options how you might do this.

John
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