This had the potential to render previously valid code invalid, if for instance the code used as an identifier.

For example, valid code is required by law on the majority of federal and state institutions' web sites in Germany.

This section lists some widely used obsolete elements, which means they are not used in valid code.

Without a valid code, the telephone equipment will not put the call through.

But such offers were suspect, they said, because surrendering valid codes only hastened their demise.

Similarly, they may be chosen so that they are not valid codes in the instruction set for the given architecture.

The reversed forms of the valid codes are not valid, to identify the direction in which to read the code.

However, I will have to be fully functional to test the valid codes and determine their function.

Unless the transponder replies with a valid code, the computer will not allow the engine to be started.

Anything other than a valid code would be ignored (including spaces, tabulators, asterisks, etc..