  ++ N O .   O F   L I N E S   A R G U M E N T ++
 Many commands take one of these - some take two. They are always optional and
so can be omitted or specified as null in either of which cases they take their
default values. Defaults vary from command to command - see individual
specifications (i.e. do a "HELP" on the individual commands). The most common
default is 1 i.e. do whatever was specified for the specified line only. Greater
than 1 means 'do it for that # of lines starting at the specified line'. A
larger number than the number of lines to the end of the file may be specified
in which case a message is output when end-of-file is reached, the command then
terminating normally.
 Another format is available, but will be found to be of use chiefly within q
macros. Rather than giving a decimal number, give the letter 'T' followed by a
single character identifying one of the 80 possible tab positions (these are
listed under the ASCII reference table - H AS for details). Then the value in
that tab becomes the numeric argument. Thus you could Locate a string between
the positions defined by tabs 1 & 2 by a command of the form:
 L <string>,,,T1,T2
 -TO format
 It is also usually possible, when a real # of lines is being specified (i.e.
not a column position) to use the construct "-TO <line #>", where -TO can be
abbreviated to -T or -. The inclusive # of lines to the specified line from the
last sensible line # given is how this is interpreted. E.g:-
 DELETE 537 -TO 600 /* abbreviates to "d537 - 600"
