qb45advr.hlp (Topic list)
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@L8135
:nON COM(n) Statement Details
  QuickSCREEN      Details      Example      Contents    Index
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ON COM(n) Statement Details
 
Syntax
  ON COM(n) GOSUB {linelabel | linenumber}
 
If your program receives data using an asynchronous communications
adapter, the BASIC command-line option /C can be used to set the size
of the data buffer.