Mulitple scripts in System 7 From what I vaguely recall, you can copy foreign language scripts and keyboard layouts to an English System 7 file and it should be able to handle them in some way. Questions about mixed script systems are appearing more and more. Here is a summary of my experiments on this topic. All of these can be dragged into the System folder, the first will go into the extensions folder, the rest into the System suitcase. Make sure that you do this after shift-restart and no applications open.
Some applications are script-savvy, in that they change the script depending on the document.
Originally I had English 7.0.1 and Arabic 6.1 and when I booted from Arabic and ran the Installer to upgrade to Arabic 7, I had no problems - it duly replaced my Arabic System and Finder and cdevs. At this stage however I had only installed a minimal version of Arabic 7.0.1 because I didn't have the disk space. I then decided to make more room and install the full System. So I hid my English System folder again, booted from Arabic on the hard disk and ran the Installer from the floppy, as before. What the Installer had done is trash my English System file and Finder and all the English Apple cdevs and extensions, but not INITs from other sources which remained in their original folders.