Young Emily was having trouble with her computer.  So she called
Tony, the computer guy, over to her desk.  Tony clicked a couple
buttons and solved the problem.

As he was walking away, Emily called after him, "So, what was
wrong?" and he replied, " It was an ID Ten T Error." 

A puzzled expression ran over Emily's face.  "An ID Ten T Error?
What's that ...  in case I need to fix it again??"

He gave her a grin...  "Haven't you ever heard of an ID Ten T Error
before?"

"No," replied Emily.

"Write it down," he said, "and I think you'll figure it out."
(She wrote...)

              I D 1 0 T