Try with QuickEdit disabled, that's my preference. Have you checked whick keyboard layout you have active? If this does not help, I have no more good suggestions.

>Which Windows version is run on the workstation? Have you tried to check the Edit Options settings for the specific Dos windows? (rightclick the titleband for the window and select Properties)
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>win 2000 , in edit options , quickedit and insert mode are both checked.