What are 4DOS, 4OS2, TCWIN16, TCWIN32, and TCOS2 ?

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4DOS is a command interpreter for DOS, DOS+Windows 95/98/ME, and Virtual DOS Machines under OS/2 Warp, that can be used as a replacement for COMMAND, the bundled default command interpreter. It provides all of the functionality of COMMAND, and a lot more besides, such as :

There are also other products in a similar vein:

These have several features that aren't practical or practiable on plain DOS. For example, 4OS2 for OS/2 Warp has :

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