CheckMark programs have a preference to Open Last Company on Launch. Once selected, the program will always open the last set of files that were open when you last Quit/Exited the program.
To set this option, launch your CheckMark program and using the File/Open Company; Open Recent Company or Find Company option, open the desired data set.
MultiLedger:
Choose User Settings under the File menu. Select the Open Last Company on Launch check box and click OK.
Payroll for Macintosh and Windows:
Choose Preferences under the File menu. Select the Open Last Company on Launch check box, close the window and click Yes when prompted to save changes.
Canadian Payroll:
Choose Preferences under the File menu. Select the Open Last Company on Launch check box. Click Save.