>With some printers such as HPG85, XEROX LASER 8p... when I issue a "REPORT FORM repname.." command and after that I issue e SEEK() command I get a message "Ilegal operation ..." error and the program crash/close.
>>>>>


There has been some dicussion here regarding bad printer drivers with HP 4050, among others. This appears to be especially the case with certain drivers with Windows NT and Windows 2000. Here is a transcript of message #401771

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Hello, and thank you for using HP Subscription Services.
You asked Subscription Services to notify you when the
following downloads or drivers changed:


HP LaserJet 4000 printer
HP LaserJet 4000 PCL 5e driver

Description:
HP LaserJet 4000 PCL 5e driver,v4.3.2.44 Windows NT4.0/Windows 2000.

Language: American English
Operating System: Microsoft Windows 2000

Click to download:
http://www.hp.com/cposupport/printers/software/lj307en.exe.html
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HP LaserJet 4000 printer
HP LaserJet 4000 PCL 6 driver

HTH