[wix-users] [INSTALLLEVEL] value

[jovan27 at gmx.de]

When I put this in my product.wxs:

   <Condition Message="[INSTALLLEVEL]">
      <![CDATA[0]]>
    </Condition>

It shows a message box displaying  "1: 0 2:"

The docs say:
The installation level for any installation is specified by the INSTALLLEVEL
property, and can be an integral from 1 to 32,767.
If no value is specified, the install level defaults to 1.

So, the question is: What is "1: 0 2:" ?