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What is use of "$" and "&" sign in Install Exec Condition in InstallShield?

In many of the Custom Actions I saw the "$" and "&" sign in Install Exec condition of a Custom Action in InstallShield. I did not get the significance of these signs.
Here are some examples of such conditions 

(&Server=2 Or &Client=2)  
$capicom.dll=3

So can someone tell me the use of these signs ?

Solution

  • These are standard Windows Installer Conditional operators. Everything is explained here: Conditional Statement Syntax