MyOtherViewClass new openWidget
The new widget will be opened in the currently active UlcApplication, which is well defined if the message was sent from a process started by ULC. This means that opening views from an existing view will result in the new views being created in the UlcApplication/UlcContext of the view from which they are opened. Under most circumstances the issue of what UlcApplication will hold a new view is of no concern for the application developer. If you are unsure whether the Smalltalk process is owned by your UlcApplication, send the #evaluate: aBlock message to the UlcApplication's processOwnerToken and open the new view inside aBlock.
MyOtherViewClass new openWidget
Again, if unsure whether the Smalltalk process is owned by your application, proceed as described above.