What am I doing wrong here

[Hitesh Joshi]

ok here is the deal... I figured out how to pass the variable but now
messages are not popping up on the windows screen if I use this method:

import os

Computerlist = ['PC1', 'PC2', 'PC3', 'PC4', 'PC5']
for ComputerName in Computerlist:
    print ComputerName
    s = "net send %s" % ComputerName
    os.system('s  "Message"')