What does the left side button do?

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The one jsut below volume....I can see there is the possibility to assign a press+hold function but what does just pressing it do?

Doesn't do nothing on my phone I wanted to get it to lauch voice command but still working on it.

Push and hold it - it will activate the media player. You can chnage this in the button cpl

yes i want a press to activate voice command not a press and hold that lauches resco explorer on mine :) but default is media player.

Go to :
Start
Settings
Buttons
scroll down to the hard ware button you wish to reasign , so its highlighted .

Below you will se a
2. Assign a program

click the radio button scroll to voice command

click ok

Job done