Possible to go to col/line with DDE command?

[Glenn]

I'm working on an add-on/tool that allows pushing/popping tags. I'm able to tell TextPad to open a specific document from the add-on with the DDE command [open("filename")]. But, I can't figure out how to tell it to go to a certain column and line, like I can when I specify these at the command line. Is that possible?

The reason I was hoping to use DDE was to reuse the same instance even if the user has turned on 'Allow multiple instances to run'. They way I've gotten around this so far is to tweak the registry settings to turn this option off before calling WinExec to open the new file via a command line, then setting it back to its original setting. It works, but it seems like a major hack.

Thanks,
Glenn