Is my Mac G3 compatible with Wifi?

1. It isn't possible to tell based only on that; the computer needs to have an AirPort Card or other 802.11 component to connect to Wi-Fi.

2. It depends on what OS the computer is running.

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Choose About this Mac from the Apple menu, click on More Info, and see what's listed. In particular, check the model identifier and any information under AirPort or wireless.

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I've gotten a Tenda W311M wifi dongle to work on my iMac g3 600 running 10.4.11. This was a software wifi dongle which implemented most of the function on the mac. Took 15% of the machine processor power.

Ethernet Bridge Solutions

1. Ethernet Bridge
   "The versatile Wireless-G Ethernet Bridge can make any wired Ethernet-equipped device a part of your wireless network." from linksys. The supports both web browser based or program configuration. For the program, you need mac os x 10.5 or greater or windows xp to configure. Once configured, you can use it on any ethernet port.
   http://www.amazon.com/Linksys-RE1000-Wireless-N-Range-Extender/dp/B005FDXMJS/ref =sr_1_1?ie=UTF8&qid=1314563758&sr=8-1
   (examples include Netgear WNCE2001 and Linksys WET610N)
2. Airport Express
   Airport Express is an external unit and you can configure it as a bridge. 802.11n ( You will need a more modern version of Mac OS X to configure. Sadly, Apple uses a configuration program to configure, not a web browser. ) Please note this requires mac os x 10.5??? or greater to configure or windows xp to configure. Please verify requirements before buying. Once configured, you can use it on any ethernet port.
   https://www.apple.com/airportexpress/
3. Netgear WNCE2001
4. Linksys WET610N are only two bridge examples.

USB Adapters

1. BearExtender
   http://store.bearextender.com/products/bearextender-mini
2. Newer Technology MAXPower 802.11n/g/b USB Adapter. New Technology has made these adapters for a while this one is for OS X 10.5 and greater.
   http://eshop.macsales.com/item/Newer%20Technology/MXP3802NU2C/
3. Newer Technology MAXPower 802.11n/g/b USB Adapter. New Technology has made these adapters for a while. What Mac OS they supports changes over time. Be careful which one you get. Amazon claims to be selling older ones as of 2/16/2013. http://www.amazon.com/NewerTech-MAXPower-802-11n-Wireless-Extension/dp/B00132CMN C
4. Tenda W311M
   http://www.microcenter.com/product/373032/W311M_150Mbps_Wireless_N_USB_20_Adapte r
   Most of the real work is done in software. Took 15% to 25% of the processor in my iMac G3 600 😟
5. Edimax EW-7722UTn -- 300Mbps Wireless 802.11b/g/n Mini-size USB Adapter
   http://eshop.macsales.com/item/Edimax/EW7722UTN/Specs
   10.4 / 10.5 / 10.6 / 10.7 / 10.8

The letters n/g/b correspond to the speed of the data transfer. You should match the speed to your existing router. You best match on the highest speed. N is the highest. G is middle. b is lowest.

1. Apple Airport Card + Adapter

   Apple AirPort Carrier Card Adapter Pulled p/n M8753G/A or 076-0804 To use an AirPort Card with certain iMac models (G3 iMacs and others), you will require the use of the AirPort Card Adapter (Airport Card sold separately).

   http://www.swnetworksolutions.com/m8753g-a.html
   image: http://www.info.apple.com/images/kbase/107908/107908_11.jpg
   You need to do a firmware update for the Apple Airport Card to support WPA.
   http://support.apple.com/kb/ht2594
   Technical Details

   Wireless!! This Airport Card supports a wireless data transfer rate of up to 11Mbps with enhanced 128-bit security and firewall protection support! The Apple AirPort Card features cutting-edge wireless networking technology that gets you on the Internet from practically anywhere without cables so you can stay wireless! Its 2.4 GHz spread spectrum radio output power complies with IEEE 802.11b industry standard to allow for interoperability with other 802.11 compliant products!

   * Original Apple-Mac Airport 802.11b Wireless Card General Features: Up to 11Mb per second
   * 2.4GHz spread spectrum radio output power Enhanced 128-bit security and firewall protection support
   * Works with the following: iMac (Slot Loading) (requires adapter)
   * iMac (Summer 2000) (requires adapter) iMac (Early 2001) (requires adapter)
   * iMac (Summer 2001) (requires adapter)
   * Support only the older WEP standard
   source of infohttp://support.apple.com/kb/HT1621
2. PCI
   EW-7128Gn, EW-7711In, EW-7722In, EW-7728In, EW-7727In, EW-7708Pn
   802.11n PCI Driver/Utility for Mac OS 10.3 / 10.4 / 10.5

You can look around for wireless networks. See: iStumbler - 98

find AirPort networks, Bluetooth devices, Bonjour services
http://www.versiontracker.com/dyn/moreinfo/macosx/17572
Robert You can look around for wireless networks. See: iStumbler - 98 find AirPort networks, Bluetooth devices, Bonjour services http://www.versiontracker.com/dyn/moreinfo/macosx/17572 "NetSpot is the easiest native wireless site survey software for Mac" OS X 10.6 or greater http://www.netspotapp.com/ Robert

'More Info clicking "More info" brings me to another page. Nowhere on that page do I see "AirPort" or "Wireless".

Is there an expandable Hardware list there, or Network?

And no Wifi/Airport listed under Network?

You don't have it then, it was an optional add on back then. 😟

there are several options for adding USB or PCI WiFi to a Mac, most of these products may require at least 10.4 or higher, it's hard to find gear compatible with 10.2 these days, not impossible, but most of that stuff is discontinued and just harder to find.

one option for adding wireless to a machine that has an Ethernet port is a wireless Ethernet adapter. To initially configure the device you would need to set it up on a newer OS Mac or PC, but once configured to connect to your WiFi, any Ethernet port will do, no special drivers needed.

for example:

http://www.amazon.com/IOGEAR-Universal-Ethernet-Adapter-GWU627/dp/B004UAKCS6

A good site for looking up detailed specs on particular mac models, check out http://www.everymac.com they have many articles on upgrading macs and may have some useful info on your particular machine.