using arduino as on/off switch to control 100 motor individually

[bigred1212]

Shift Register 8-Bit - SN74HC595 - COM-13699 - SparkFun Electronics is a shift register, if that is what that last post was asking.

Or here. http://www.jameco.com/webapp/wcs/stores/servlet/Product_10001_10001_911189_-1

Or other places. shift register at DuckDuckGo