INNO tables - will I have problems?

Hi, I'm prety new to PHP and MySQL (but have many years of Perl and ASP programming). I need to code a PHP version of one of our ASP products - in looking through the MySQL manual, I find that it supports cascades when using INNO tables. This is very close to our Access/MSSQL database in ASP, so I would not need to rewrite so much of the SQL. The question is will INNO tables be available to all users on shared Linux hosting accounts? I obviously have no control of which ISP and end-user may choose, although our product will specify that Linux, PHP4, and MySQL4 (or higher) are installed. The manual says that these are built-in on version 4.0 and above - I just need real-world confirmation from people with more experience in this area than me. Cheers Julian