I'm afraid that the following solution qualifies as possibly the worst way
to display MPE help text for a function:

>If you forget this, you can try the back door using a known function name.
>Using MPEX, that's
>
>    /%print cicat.pub.sys;search=cl "ltrim";prev="\ENTRY"
>    \ENTRY=FUNCTIONS
>    LTRIM              Trims left end of string
>    \ENTRY=LTRIM
>    Syntax:     LTRIM(string[,trimstr])
>    Example:    'X'+ltrim(' abc')
>    /

Just do

    %help :ltrim

It shows the exact same CICAT text, but also highlights the keywords for you.