The Ctrl + 3 shortcut allows you to search and perform all available commands in Model RealTime. This shortcut brings the focus into the Quick Access search box where you can type the name of the action you want to perform (search, navigate, build, etc). You can also easily find a specific preference page or wizard.
The example below shows result for "build" search term.
In addition, you can search for the opened view or editor by typing the name of the resource which the editor shows.
You can restrict the search to a particular category (Commands, Views, etc) by typing the category name followed by a colon. For example, to filter the list of all views, type "View: " in the search box. The tooltip on each search result shows the keybinding if it exists, and the list with previous choices already opens when you click the field with the mouse.
Do you want to search for the shortcuts? Use Ctr+Shift+L to see the list.