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HlpAdd

Push current help category, then set help category.

Header File.....TCXLhlp.h

Prototype.......IntT CTYP HlpAdd(TagT ht);

Source File.....HLP\HLPSET.C

Arguments.......ht -  Help Tag-ID

Returns.........ERR_NUL  -  No Error
                ERR_ARG  -  Argument Failure
                   TcxlErr contains:
                   W_NOHLPDEF  -  No Help Record Defined
                   W_HLPSTKOV  -  Help Stack Overflow (Stack Full)

Notes...........Adds the current help category to the help category stack,
                then sets the current help category to the specified help
                category.  It's effectively the same as doing a HlpCur()
                followed by a HlpSet().