I need to open package spec & body in PL/SQL Developer by package name from myself program.

How can i do it in v5.1.6 ?

if it's not possible, add this wish to wish list? please.

In the Command Window you can simply type:

SQL> edit <packagename>

I'm not sure if this is what you mean though.

Now there are command line parameter "editobject" for this purpose.

But one more question: if I call ShellExecute from my programm with this parameter, Windows will open a new instance of the PL/SQL Developer and my object will be opened there.

Is it possible to open from external application a my database object in the already logged-in instance of PL/SQL Developer? Can You provide some of single-instance-per-login mode for PL/SQL Developer by some kind of interprocess communication between new instance and already executing instances?

Aren't there standard DDE messages to open a file?

[quote=Marco Kalter]Aren't there standard DDE messages to open a file? [/quote]
How to open database object with DDE in PL/SQL Developer, logged in proper database?

For a database object this will indeed not be possible.