About wireless roaming question

[littleturtle]

Hi Guys,

I'm using Fedora 13 , wireless card:Intel 512AN_MMW
kernel version:2.6.33.6-147.fc13.i686

below is my problem:

when i finished install F13,i can use Wireless card surfing internet
i have multiple ap's , and if the ap set with same ssid and different channel , i can roaming between ap's if i'm accessing the internet ,
otherwise, [COLOR="rgb(139, 0, 0)"]it won't change to greater signal ap if i'm not using the internet[/COLOR] , does this condition normally ?

====important question here====
The other question is , if i'm using different ssid , like "office01" "office02" , can i roaming between this two ap's automatically ?
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thanks for your reading and apologize for my poor english!!