When you INSTALL a new module (using Host -->Module Definitions or Host-->Extensions interface), its various user controls (.ascx files) and other supporting files will be placed into a folder under the DesktopModules folder.

If you are asking about what happens when ADDing a module to a page, normally only database changes are made.

If you tried to INSTALL a module and its files did not appear in a folder under the DesktopModules folder, did you see any error messages during the installation? What module (and its version) were you trying to install? What is your DotNetNuke framework version?

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Bill, WESNet Designs
Team Lead - DotNetNuke Gallery Module Project (Not Actively Being Developed)
Extensions Forge Projects . . .
Current: UserExport, ContentDeJour, ePrayer, DNN NewsTicker, By Invitation
Coming Soon: FRBO-For Rent By Owner