Like the PlayStation3, the PS VITA also has several commands implemented in it's webbrowser which can trigger several system functions. Here are a few:
about:memory
This command simply shows the webbrowser memory usage. The resulting content is displayed by using the data URI scheme. (http://en.wikipedia.org/wiki/Data_URI_scheme)
psns:browse
This command supports several arguments, the most usables are:
psns:browse?category=
psns:browse?product=
By defining a category or product ID, this command will redirect you to the PSN Store and show you the chosen category/product. A few examples: