CURIOUS,
" ...again is it possable for anyone meaning public to get access to the company fequency from the outside?."
Yes, it is. Depending on the type of system, it is, unfortunely, rather easy. Anyone with a cheap icom U-16 (a field programmable walkie-talkie type radio), for example, and the right data (correct frequency and tone information) could cause havoc on UHF systems. Company frequencies are not the only ones subject to this type of unauthorized use. It is not unheard of for public safety systems (police, fire, ambulance) to suffer from malicious jamming as well.
"whether or not if it is shared with another company??? is it legal to share a fequency with another comapny??????"
Most frequencies are legally shared. It is the rare business/industrial frequency that is licensed for an exclusive user. There simply are not enough frequencies to go around. In a correctly designed and engineered system, most users would not even be aware of other users on a particular channel.
"or would it strictly be only one business who holds/owns/or licensed to the fequency ."
No one "owns" frequencies, just like no one owns air. Frequencies are essentially a natural resource. The basic role of the Federal Communications Commission is to insure that a limited natural resource is used in an organized fashion [Please folks, I don't want to start an argument here about how they are doing their job. We all know] Again, as stated above, it is rare to find an exclusive use channel out there, particularly in the commerical bands.
"also where can i obtain info about what the company's frequency is or if it had changed..."
The FCC's on-line database is a great resource. Click on
http://svartifoss2.fcc.gov/reports/index.cfm It's not the world's easiest database to surf. The company you are targeting might be licensed under a DBA ("doing business as"), or might be licensed under the name of the owner, as opposed to the name of the company, if they are even licensed at all. It is possible that the company you work/worked for could be leasing air time on (and, therefore, operating under the license of) a local radio shop's two-way radio system and, in that case, you probably won't find a license in the name of your (ex-?) outfit at all.
"do they get to change it meaning there frequency??"
Yes. Assuming that a company was licenesed to being with (could be a big assumption), through a process called license modification, a frequency assigned by the FCC to a company can be changed, for a wide variety of reasons.
"and can i obatin such records of trasmittions from which it came from????"
It is highly unlikely. I know of no business/industrial radio users that go out of their way to record their radio traffic. Public safety agencies routinely do; commerical outfits don't.
"i really hope that i can get help here,and this is my only way to educate myself before going to the "big guy" to state my case."
I wish you luck in your endeavors. You have an uphill battle.
SCANdal