You can access a number of different applications while playing games on the PlayStation Vita. One of the things you cannot do is web browse at the same time.
Pressing the PS button while using the PS Vita you can access a number of features. This includes your personal music collection, friend’s list and the system’s twitter application. You can then jump back onto the game you’re playing effortlessly after this when you are finished.
Sadly, Impress Watch has reported you won’t be able to do this if you wanted to use the web browser. If you are stuck on a particular PS Vita game and wanted to browse for a guide, you have to quit the game and then browse the internet. Sony suggests this issue could be fixed with an update.
This feature isn’t too disappointing. PSP gamers couldn’t access much while playing games. You had to quit the game all the time if you wanted to access anything else on the system…
Source: Andriasang