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GBIC >> QBasic >> QBasic vs QuickBasic

QBasic vs QuickBasic
As have been stated, QBasic is a subset of Microsoft's commercial QuickBasic product. Here are the QuickBasic keywords which are not supported in QBasic. As you can see, the differences are rather small.

System Calls
COMMAND$, Int86, Int86XC, Interrupt, InterruptX, EVENT, UEVENT, SIGNAL
Declarations
CDECL, ALIAS, BYVAL, $INCLUDE, LOCAL, SADD, SETMEM

Also, QBasic does not have QuickBASIC's Load, Unload, Create File, DOS Shell, Undo, some View, Search, Run, and Debug options, has no Calls function, or right-click options.