For the mission pak just add the -game option (I forget which mission pak uses which option). It should be in the readme file. It's either -game hipnotic or -game rogue (I believe). Just add this at the end of your glquake.exe shortcut. Take a look in your /quake folder to see which of these are installed.
[This message has been edited by Huge (edited 02-03-2000).]
Asus P9X79-Deluxe, Intel i7 3930k @ 4.2Ghz, 16gb DDR3-1600 Kingston HyperX Memory, Coolermaster Storm Trooper case, Corsair AX850 psu, Geforce 680 SLI, Corsair Model H100 w/c, Samsung 840 Pro 512gB SSD, Asus Blu-ray Writer 12x, Windows7 Pro x64