Creating a file in temp

Geoff_Price_(JTASCAdmin_(Delete)_1422989)

I am creating module that adds a version to a document node from POST data. From what I understand the default way a version is uploaded a temp file is created (by the livelink cgi) in a temp directory. The filename is then passed to the AddVersion RH and the funtion NodeAddVersion takes care of it from there. Here are my questions: How do I find out where the temp directory is (/tmp /var/tmp c:\temp ???)? (the module could run on solarus or win and I would like to avoid hard coding paths) After I create the file do I need to worry about deleting it?Jonathan