When working on the install part (not pre-install, not post-install), there is an action Display Message but this is only for GUI mode.
There is also the possibility to use Output Text to Console but ... there is no possibility to interact with the user. In particular there no possibility to stop temporarily the install. It makes this not very convenient especially because the console window is automatically destroyed.
By temporarily, I mean till the user has reacted on the message.
In GUI, there is a Display Message Dialog (see picture) It means the install stop working to display the dialog till the user has hopefully read the message and press one (of the) button(s).
For instance you have an action that should stop a service but there is an issue. You want to let the user know about this and decide what can be done: continue, try again, perform some manual task before going on, ...
If the dialog would be smart enough, it would display both in GUI and console mode without making any distinction. At least a console dialog should be available also during install phase and not only during pre-install or post-install.
Doesn't Console: Display Message do what you would like it to do? Otherwise, I guess the only workaround would be to use the Console: Get User Input in order to ask the user if (s)he understood what you've just displayed and have them type 'ok' for instance, in order to proceed.
