[This is preliminary documentation and subject to change.]
The property value denotes a list of component ID's, delimited by commas, that are to be installed locally. Specifically, for each listed component ID, the installer examines all features linked (via the FeatureComponents table) to that component, and installs the "cheapest" feature (i.e. the feature that would require the least amount of disk space to install). The components listed are to be found in the Component column of the Component table.
Command line.
MsiEngine uses this value to determine which feature(s) are set to be installed locally, based on the specified component(s).
None.
Note that the component names are case-sensitive. Also note that if the RunFromSource column of the Component table for a component has a value of irsSourceOnly then the component will be installed to run from source.