It generates a code for a batch file. Batch files are files with the extension .bat which you can create with Notepad from Windows. Everytime you open the file it performs certain arctions like copying and deleting files and folders and even shutting down or rebooting the computer.
Most small businesses therefore do not issue checks with the length of time the check is valid printed on the face of the check. If your company writes a check, someone legally could attempt to cash it 10 months from now or in 18 months. Although banks can refuse to process checks that are over six months after the date on the check, rarely do the processors look at the date on the check.
In general, according to several different experts I talked to, a check is good for one year from the date it's written. The time limits written on the face of the check, whether it is 60 days or six months, often mean the issuer is trying to keep the books as up-to-date as possible. They tend to be more of a guideline than a hard rule. That's, in fact, what employees at my bank said when suggesting that I put the two checks through.