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.
An HSBC bank Cheque is valid for a period of about six months but some banks require a check be cashed within ninety days of the issue date or else the funds go forfeited.