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Append Counter Keyword

<AppendCounter N>
<apc N>

    When this keyword is included in a frame the value of counter N (see <SetCounter>) will be appended to the current frame's display.  This keyword superseded by the <sprintf> keyword.  Only one of <sprintf> or <AppendCounter> is allowed in a frame.

    If you wish to change the formatting of the counter make sure the RTF formatting does not end with the quotes, for example to have a completely green display the following would be required:
/ "counter 1: " <apc 1> /

    Should you desire to have characters displayed after the counter's value <ProgressiveX> can be used. While needing you to estimate centering manually it simplifies the <SkipDisplay> example considerably:

f20 <nfb>
0 "ErrorRate Feedback Example" <bu 1000>;
<set c1 = errorrate> <px 0.4> "Error Rate " <apc 1> , "%" / <return>;

+1000 * "target";
+1000 * "target";
<call -111> c;

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