(dc.info)Miscellaneous

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10 Miscellaneous
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'!'
     Will run the rest of the line as a system command.  Note that
     parsing of the !<, !=, and !> commands take precedence, so if you
     want to run a command starting with <, =, or > you will need to add
     a space after the !.

'#'
     Will interpret the rest of the line as a comment.  (This command is
     a GNU extension.)

':R'
     Will pop the top two values off of the stack.  The old
     second-to-top value will be stored in the array R, indexed by the
     old top-of-stack value.

';R'
     Pops the top-of-stack and uses it as an index into the array R.
     The selected value is then pushed onto the stack.

   Note that each stacked instance of a register has its own array
associated with it.  Thus '1 0:A 0SA 2 0:A LA 0;Ap' will print 1,
because the 2 was stored in an instance of 0:A that was later popped.