Send/PostMessage question

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Hi,

I'm  tring to communicate my VB program with Eu program, but since I'm
not  expert  at  VB  and  Win  API,  I  wanted  to  use  SendMessage /
PostMessage to send data from/to those processes.

1. What is the difference between SendMessage and PostMessage?

2.  If  I  send,  for example, 1000 messages from the VB program to Eu
program using for loop (so no delay between them),
  - will they be received in order?
  - will they always be received? (no one message is lost)

  
Thanks in advance.

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