BB crank arms question

[MACinRWC]

how does the square tapper bb in this pick change the type of crank arms I can put on it-are there screws needed-is that a screw on the pic?
thanks for any info
http://i194.photobucket.com/albums/z49/machart/cb46_3.jpg

[sj_roadie]

Youll probably get a faster and more informed reply in the bicycle mechanics forum.