What's the purpose of a global filter?
When you use a global filter it will affect the following views:
The same global filter will be applies to all views and you can use view specific filters to refine the filtering even more.
What can it be used for?
If you have a collection thats divided into specific folders like:
You can quickly set a global filter to "path starts with d:\untagged" to only work with your untagged files.
The same logic can be applied if you have splittered your collection into different paths depending on genres, e.g.:
It can also be even more powerful if you work with custom fields. Assume that you are using CUSTOM_1 to define a specific type of classical music. It can be set to "Baroque", "Reniassance" and other values.
This way you can quickly define a global filter to "Custom 1 is Baroque" to only see items (no matter which part, artist etc. they are from) that meets the "Baroque" criteria.
We have some rough plans to support more field expressions for the filter to make it even more powerful (compare with the Advanced search structure).