There isn't such a limit.

>There were some implementations allowing longer texts, but then of course had a different GUI -
>IIRC Steve Black of Foxpro Wiki and other fame put one out into Open Source, which we used with a table based translation. Texts were entered into a table - but uncertain if that was included in Steves sources or homegrown.
>
>
>>I use MESSAGEBOX() to show message on the screen but it's limited to 255 characters.
>>
>>is there any way which can show more characters?
>>
>>Thanks in advance
>>
>>Jerry Yang