Like with IMAGE objects, TSFE also holds some interesting info whenever a typolink is created.
Here's an example that retrieves the last link and target after the typolink has been created.

lib.lastTypoLink = COA
lib.lastTypoLink {
  10 = TEXT
  10.value = test
      # Remember to change this to a page that exists in your system.
  10.typolink.parameter = 26
  10.wrap = |<br />
   
  20 = TEXT
  20.data = TSFE:cObj|lastTypoLinkUrl
  20.wrap = lastTypoLink Url =&nbsp;|<br />
   
  30 = TEXT
  30.data = TSFE:cObj|lastTypoLinkTarget
  30.wrap = lastTypoLink Target =&nbsp;|<br />
}

Related snippets:

More fun with TSFE - Getting image information

Fun with TSFE Part 1: Getting additional IMAGE imformation

Fun with TSFE Part 3: Getting client information

Fun with TSFE Part 4: Other useful information

This snippet was submitted by Peter Klein