This property is a set values that determine what kinds of comments will be cutted from SQL query text before sending it to MySQL server. The following table describes possible comments styles:
Processed by default
All symbols from '--' until end of string are cutted
All symbols from '#' until end of string are cutted
C-style comments are cutted. For example '/* this is comment */'
You can set ProcessComments to  (empty set) to allow MySQL server to process all kind of comments by itself. But this can cause problems if you are using query params.(Params, ParamCheck, ParamCount properties).
This property can be very useful if your literal constants contains '--', '#', '/*' or '*/' symbols. Just set to remove appropritate value of TmySQLQueryProcessComments from ProcessComments property.