How to check cookies are enabled for PC's

Internet Explorer 6.0, 7.0, 8.0
IE Click on 'Tools' at the top of your browser window and select 'Internet options' , then click on the 'Privacy' tab
Ensure that your Privacy level is set to Medium or below, which will enable cookies in your browser
Settings above Medium will disable cookies
  Mozilla Firefox
Mozilla Click on 'Tools' at the top of your browser window and select Options
Then select the Privacy icon
Click on Cookies, then select 'allow sites to set cookies'
  Safari
safari Click on the Cog icon at the top of your browser window and select the 'Preferences' option
Click on 'Security', check the option that says 'Block third-party and advertising cookies'
Click 'Save'
   
How to check cookies are enabled for Macs

  Internet Explorer and Microsoft Internet Explorer 5.0 on OSX
IE Click on 'Explorer' at the top of your browser window and select 'Preferences' options
Scroll down until you see 'Cookies' under Receiving Files
Select the 'Never Ask' option
  Mozilla Firefox
Mozilla Click on 'Mozilla' or 'Netscape' at the top of your browser window and select the 'Preferences' option
Scroll down until you see cookies under 'Privacy & Security'
Select 'Enable cookies for the originating web site only'
  Safari & Safari on OSX
safari Click on 'Safari' at the top of your browser window and select the 'Preferences' option
Click on 'Security' then 'Accept cookies'
Select the 'Only from site you navigate to
  Opera
Opera Click on 'Menu' at the top of your browser window and select 'Settings'
Then select 'Preferences', select the 'Advanced' tab
Then select 'Accept cookies' option

All other browsers Please consult your documentation or online help files.