Are both sessions attempting to access the same files? Could be a share vilation
Actually, and i am sorry sysco, but, Dos based applications in Win9x and up have used 2 access methods, Real mode, which forces a restart in Dos mode using a config file called Config.dos, and the a Virtual machine mode, utilizing a PIF file (program information file) for setting the Dos environment.
WinNT, Win2K, and WinME actually use a proprietary app called cmd.exe, to emulate a Dos environment, inside it's own virtual machine. (Microsoft is trying to retire Dos),
and they will not directly support real mode apps. The configurations are going to be very similar though....read on...
The pif file settings can be edited by right clicking on the iconused to launch the application, and choosing properties.
from here, memory configuration and dos environment settings can be adjusted to control how this application will function inside it's virtual machine.
You can reference your Clipper manual for assistance in configuring the program environment required for each of your sessions.
Good luck....