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[tawi]

Hello,
In my Project the user needs to install 2 components. I want to use the
"Select Install Type"-screen. But I need this screen to include
different options, dependent on if one of the components is already
installed on the user's system. So if none of the components is already
installed he MUST install both components, otherwise he should be given
the possibility to choose just one or even both of the components.
In short:

If a read from the registry declares that none of the components is
installed, the user should only get a screen showing which components
will be installed (without the possiblity to choose).
If a read from the registry declares that one of the components is
installed, the user should only get a screen where he is shown which
component must be installed and which he can (but not MUST) install.
Can I include a screen condition looking this way:

Read from Registry(%myLoc%=HIGH_KEY_LOCAL......)<>0

or just %myLoc%<>0 ,if I have already tested this in actions before
installation?

Or am I totally wrong and there is a very simple way to realize something like that?

Thank you in advance and sorry for my english...

Greets, tawi