writing to a file

How could i write to a file, without deleting the current contents of the file, instead adding onto it?

Reading/Writing files

hmm...that works wonderfully, but could i write into a file quotation marks, it being a code character inside blitz3d, I need to write quotations into my file, how can this be done?

MyString$="...And then I said, " + Chr(34) + "Hi!" + Chr(34) + "..."

Or...

quote$=Chr(34)

Mystring$="Bla Bla Blah " + quote + "Blah Blah Blah" + quote + " Blah Blah Blah"

Note:
To learn every ASCII character so you can put anything into the file,

http://www.blitzbasic.com/codearcs/codearcs.php?code=2028

that works, thanks a bunch.