Well it's a must, both for running games and original hardware/software on the correct computer from the correct timeline.
I have this setup with a switch that can switch between them with the same screen, mouse and keyboard at the same time.
Win95, Pentium 90, 16MB EDO, DOS 6.22/Win3.1, EMU APS, SB16 (ISA), 300MB HD, Diskette.
Win98, Pentium II 300MMX, 256MB SDRAM PC133, EMU APS, SBAWE64 Gold (ISA),
GeForce2 MX200 32MB SDRAM, 3DFX Voodoo2 SLI 2x12MB, SCSI 3GB, IDE 12GB,
CD 24X SCSI, CDR 4X IDE, Zip250, Diskette.
WinME, Athlon 1200, 512MB SDRAM PC133, EMU APS, ESI Waveterminal 192L,
40GB E-IDE, GeForceFX 5200 128MB SDRAM, DVDR 18x IDE, CDR 52x IDE, Diskette.
WinXP, Pentium III 1GHZ, 512MB SDRAM PC133, EMU APS, EMU 1212M, EMU 1820M, 80GB
E-IDE, 250GB E-IDE, DVDR 18x, Diskette.
WinXP (Portable but as stationary) Pentium III 1GHZ, 512MB SDRAM PC133, Audigy2ZS Notebook,
160GB E-IDE 2.5", DVDR 18x.
WinXP (Portable EEE, Outside the Switch) Atom 1.6GHZ, 2GB DDR2 667MHZ, 160GB E-IDE, 10.1",
Diskette via USB, Zip750 via USB.
Win7/64, Core2Duo 3GHZ, 4GB DDR2, SSD 40GB SATA2, 500GB SATA2, 250GB E-IDE, Audigy SB1394,
EMU 0404USB White, DVDR 18x, GeForce GTS250 1GB GDDR3.
Stacked away, portable 1991-92, Win95,Win3.1,DOS6.22, SiemensNixdorf 15" (screen like 6-7")
486DX 33 or 50MHZ, 24MB RAM!!!!! 300MB HD!!!!!!!, had a desktop case to go with it that
you could insert the computer in it making it stationary!!!!
inserted the whole portable like a VHS tape in a VCR, the case had two 5.25" slots for
diskett drives, HD, CD-ROM, specially made for high executive bank officials, said to cost
around 18.000$ at the time, runs Quake at bad framerate.
Seems to be the only pic I can find of one like it
http://notebookblog.cz/blog/wp-content/uploads/stare-obrazky/pcd4nd_dock.jpg the computer always went with banks boss, working at home, inserting it in the office,
robbery at night would mean no info to be found... crazy times, the computer is still here
but I threw the desktop casing some time ago, it took enourmous space and was kinda
empty inside... but made it alot easier installing from cd.