Check whether you can use the VFP function ANETRESOURCES() (it returns shared drives and printers, not the workstations).

-or-
better see the Platform SDK (WinAPI) function NetServerEnum

Platform SDK: Network Management
NetServerEnum
http://msdn.microsoft.com/library/en-us/netmgmt/ntlmapi2_1vl9.asp

...
servertype 
[in] Specifies a value that filters the server entries to return from the
enumeration. This parameter can be one or more of the following values.
Value                        Meaning 
SV_TYPE_WORKSTATION          All workstations 
...

(SV_TYPE_WORKSTATION is equal to 1)

If you have troubles with Platform SDK structures, there are many Classes you can use for creating the WinAPI structure string in VFP. (This includes our own PSDK.VCX - it is not like the other ones free)

Kind Regards