* '''NOTE: CHAIN is no longer required using QB64 as it can run larger modules: [[Keywords_currently_not_supported_by_QB64#Keywords_Not_Supported_in_Linux_or_MAC_OSX_versions|Not currently available in Linux or Mac operating systems!]]'''
''Example:'' CHAIN looks for same file type extension as program module (BAS or EXE) in QB 4.5.
{{CodeStart}} '' ''
{{Cl|CHAIN}} "Level1" '' ''
{{CodeEnd}}
''Explanation:'' The file referred to is "Level1.BAS" if the program module using the call is a BAS file. If the program was compiled, it would look for "Level1.EXE". QuickBasic4.5 requires that [[COMMON]] or [[COMMON SHARED]] data sharing programs be compiled with BRUN45.EXE being included with the program package(the EXE file will also be larger). '''QB64''' does not have that requirement as it creates data files to pass common data information.