Unix- HELP! Are we being bluffed?

We are a multi-branch retail company, Buildware Market, in South Africa. We purchased Fourgen as the software to run our business, including aspects such as point-of-sale, financials, stock control, etc. We are in the process of implementing the software at our first branch. Fourgen is written in Informix, which runs on Unix. Our local dealer assures us that several things we thought were possible are not possible. I'm not convinced, and I would appreciate some external opinion. We want to link our office LAN (Microsoft Win for Workgroups) to the Fourgen system running on Unix. We are told that Win for Workgroups does not have suitable terminal emulators to log in to the Unix box, and that we need to purchase terminal emulation software called I-Net for EACH PC on the LAN, at a cost of US$235 per PC. This sounds excessive. Furthermore, we are told that it is NOT possible to re-map keyboard keys. Currently, the Unix box uses F3 and F4 for Page up and Page down. We have purchased Wyse terminals that have a normal PC-style 101 key keyboard. We're told that we can not re-map the PgUp, PgDn, End, Home and other keys so that they would perform the functions one might expect in, say, a Windows application. This applies both to the dumb terminals as well as the PCs on the LAN. Does FourGen have any GUI which can act as a front end to users on a Windows network? Would X-Windows work with Fourgen & Informix? Are there any other ways to operate the Fourgen box via Windows? Another problem we have is that our Unix box operates VERY slowly. We have a 486DX2-66 with 36MB ram & VESA local bus, 128KB cache, a 2GB SCSI-drive with fast SCSI controller, and a 2GB DAT streamer. We have the Informix Online engine, SCO Unix (the latest version, I'm not sure of the number), and the latest version of Fourgen Tools (I think it's 4.12). When we only have four users logged on, and we're doing purchase orders, the system nearly grinds to a halt. Our item master consists of about 6000 stock items, and we have about 200 suppliers; so our database is not really that large. Why could the system be so slow? PLEASE help us with this, as we have to go live in about 2 weeks time!!! (20 July is LIVE date) I have a further question: apparently a Unix drive can get fragmented just like a FAT drive can. How does one fix this? How does one tidy up all the fragments of mess that may be lying around? Any help greatly appreciated, and if you're in South Africa, we'll invite you to our opening party, which promises to be one to remember! Greg Frank