@PARSE[line,switches[,arg]] : Parse the command line for switches, returning an OR'd value for matching switches or optionally the argument(s) following the switch.
line - The (double quoted) command line to parse. If line is ".", TCC will substitute the command line for the current batch file.
switches - One or more switch arguments (for example, /RST will match either an /R, and /S, or a /T on the command line.
arg - An optional integer value for the argument(s) following the switch to return. A 0 will return the switch, 1 the first argument following the switch. A * will return the remainder of the command line following the switch.