I am working in a delphi IDE expert , now to avoid dependencies problems, i was thinking in rebuild this expert as a dll expert as was suggested in one of these answers, now my expert (compiled as bpl) access the Screen and Application global variables (instances of the Delphi IDE), so i was wondering if i compile my expert as a dll i can still accesing these variables and also i want to know which are the main differences between a bpl delphi expert and a dll delphi expert?
Should I compile my wizard as a DLL or a Package? Packages are easier to load and unload without restarting the IDE (and hence easier to debug), but they can create unit naming conflicts in the IDE. Conflicts happen when the name a wizard's unit matches the name of a unit in another loaded design-time package. In this case, both packages can not be loaded at the same time. The recommended workaround is to prefix all of your unit names with a "unique" prefix. GExperts, for example, uses "GX_" as the name prefix for its units.
From this very good source about OTA: GExperts