{BOUnds | BNDs} [ ? | [ col1 [ col2 ] [ EXT ] ] ]
-Set margin boundary
Boundary setting influence Find/Change/Sort/Split/Tflow commands and
Shift(<,>,(,),[,])/Paste(o,p,n)/Compare(=)/CaseConversion(u,_)/Tflow(TF,:,;) line commands.
-Set default for the directory when entered on directory list panel.
-Use INI command(write to ini file) to keep setting for the next session.
? :display help message
col1/col2:left and right boundary column
"0" means reset, "*" means keep current value.
Reset both side if operand missing.
EXT :set default for the file with same extension name as the file opened now.